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05-02-2014, 09:42 PM
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#1
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Junior Member
Join Date: Feb 2012
Posts: 23
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what grade gasoline
just curious out there what grade gasoline everyone is using with tv while pulling camper
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05-02-2014, 09:50 PM
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#2
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Senior Member
Join Date: Jul 2011
Location: SD
Posts: 441
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My gas pickup ran fine with 87 octane regular unleaded. The sell 85 octane in western SD which I tried once in an effort to not use ethanol but it's too low. I've been told there's no benefit to running higher octane gas than what the compression ratio of your engine dictates. For me that was 87 octane, now it's diesel.
__________________
2015 Sierra 357TRIP
2012 Ram 2500 CCSB 6.7CTD
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05-02-2014, 09:58 PM
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#3
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Resident Masshole
Join Date: Mar 2013
Location: Southeastern MA
Posts: 433
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87 in everything (truck, car, motorcycle, lawn mower, weed whacker, chainsaw, snowmobiles...). Everything but the car & truck (and the bike in summer) get Stabil with every tank.
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05-02-2014, 10:39 PM
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#4
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Senior Member
Join Date: Jun 2013
Location: Brazoria County, Texas
Posts: 1,460
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Quote:
Originally Posted by fast murray
I've been told there's no benefit to running higher octane gas than what the compression ratio of your engine dictates.
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Mostly correct. It's only real benefit is to prevent detonation. The higher the compression and / or the more load on the engine, the higher the chance of detonation. Towing would put more stress on the motor, so there's probably a valid argument for moving to higher octane while doing so, but it just depends on the vehicle, load, and terrain.
I run 87 in everything but the Camaro (the computer doesn't like anything but premium). The bike gets mid grade since I push it a little harder and I'll use mid grade while I'm towing, even though it might not matter either way.
__________________
2015 Chevy Silverado LTZ - HD tow package
2017 Rockwood 2703WS Emerald Edition
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05-03-2014, 05:52 AM
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#5
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Higher the octane the better the fuel mileage.
The increase in fuel mileage pays for the difference in cost.
TURBS
Sabre owners united!
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05-03-2014, 06:33 AM
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#6
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Senior Member
Join Date: Mar 2012
Location: Brookings
Posts: 561
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I run 87 all the time except towing then I swap to 89 for my SCT tow tune.
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05-03-2014, 07:38 AM
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#7
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Senior Member
Join Date: Mar 2012
Location: Williston ND
Posts: 353
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Always run 91 in everything we own, don't like how things run with ethanol and boat dealer said ethanol not recommended. My owners manual for my pick up says the same.
Sent from my SCH-I545 using Forest River Forums mobile app
__________________
Dennis and Julie
2018 Wildcat 28SGX
2013 Chevy Silverado 2500HD
2012 Chevy Silverado 2500HD
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05-04-2014, 12:50 AM
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#8
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Senior Member
Join Date: Feb 2013
Location: Ottawa ON
Posts: 111
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Quote:
Originally Posted by f1100turbo
Higher the octane the better the fuel mileage.
The increase in fuel mileage pays for the difference in cost.
TURBS
Sabre owners united!
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A CBC consumer show did an independent test of gas types last year and televised the results for various vehicles.
They used test gear for mileage and emissions as well as mechanical inspections. The high octane produced worse gas mileage and created more emissions than the regular gas. This is because the computers in the vehicle are set for a specific octane that is specified in the user manual. In some cases they noted worse performance on the road with the high octane since the computer was not set for it.
Some performance cars require higher octane but that will be specified in the user manual.
I think in the days of coils and mechanical carbs higher octane could be usefull.
Higher octane myths are fueled <g> by gas stations and gas companies since it costs the consumer a lot more.
__________________
2009 Suburban LT 1500 - 4x4 - 3.42
2009 Flagstaff 23FBS Super Lite
Nights Camped in 2015 - 21
Nights Camped in 2014 - 29
Nights Camped in 2013 - 31
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05-04-2014, 01:36 AM
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#9
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Member
Join Date: Aug 2013
Location: Oregon
Posts: 53
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91 or higher, truck has a tune that's made for higher octane.
Trailer Fuel station and generator i run non ethanol
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05-04-2014, 06:19 AM
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#10
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Senior Member
Join Date: Jul 2008
Location: central PA
Posts: 978
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Quote:
Originally Posted by f1100turbo
Higher the octane the better the fuel mileage.
The increase in fuel mileage pays for the difference in cost.
TURBS
Sabre owners united!
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I run 89 normally as I found that I get about 1.5 mpg BETTER than when I use 87. So, at 23 gallons I'll get 34.5 miles more to tank. At 13-14 city mpg, that'll save me about 2 gallons at $3.79 or so for 89. At .17 a gallon more, that tank will cost me $3.91 more, but I'll SAVE a net of $3.67. And my Tundy seems to run smoother under load.
2000 Cherokee 31BH, "flipped axles and raised",LEDs, solar, inverter, etc..aka "boondock ready". '07 Tundra 5.7L DC-LB, modded as well.
__________________
2000 Cherokee 29BH with 6V batteries, LED lights & 400 watts of solar power, flipped axles and raised. 2007 Tundra 5.7L DC-LB with lots of mods. C-co, 8/158th AVN Maint.
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05-04-2014, 07:22 AM
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#11
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Moderator Emeritus
Join Date: Mar 2008
Location: St. Paul, Minnesota
Posts: 3,368
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Quote:
Originally Posted by fast murray
I've been told there's no benefit to running higher octane gas than what the compression ratio of your engine dictates.
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I don't think that this is so true anymore. In the quest for more power out of smaller displacement engines and better fuel economy, most modern engines have very high compression ratios. Ratios this high would have absolutely required high octane fuel to prevent detonation in the old days.
In today's world of variable cam timing and variable timing advance, one can use 87 octane in high compression engines. The ECM manages all of this with detonation sensors to get maximum performance for the fuel and load conditions.
So, there CAN be some benefit to higher octane fuels in many engines. This allows more advance; giving higher performance and economy. This is especially true in turbocharged or supercharged engines.
I've monitored the timing advance on my F150 with a ScanGaugeII. I can tell you that the ECM is constantly changing the timing. And when I tow, I can definitely tell the difference between 87 and 91 octane on the truck's ability to hold 6th gear on uphills. It runs fine on 87 and doesn't detonate. But there is a performance difference when running 91.
My turbocharged VW Jetta is definitely faster with 91 and gets about 10% better fuel economy. Why? On 87 it pulls a lot of timing to prevent detonation.
__________________
2021 F350 Lariat 7.3 4X4 w 4.30s, 2018 Wildcat 29RLX
2012 BMW G650GS, Demco Premiere Slider
1969 John Deere 1020, 1940 Ford 9N, 1948 Ford 8N
Jonsered 535, Can of WD-40, Duct Tape
Red Green coffee mugs
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05-04-2014, 02:49 PM
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#12
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Guest
Join Date: Jun 2013
Posts: 273
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I have run higher grades in my Tundra, it made no difference in economy and power. Same for our CRV. Se we continue to run 87 in everything. I have not experienced any improvements in consecutive tanks of the premium stuff.
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05-04-2014, 04:37 PM
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#13
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Average Joe
Join Date: Jul 2013
Location: Mechanicsville, MD
Posts: 689
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With today's electronic systems, the octane is dictated by the computer's setup (tune). If it's factory stock and the owners manual says 87, that's what to use. I have also seen worse mpg running higher octane.
__________________
Joe and Karen
2014 Sunseeker 2450sf
Southern Maryland and Beyond!
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05-04-2014, 04:49 PM
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#14
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Senior Member
Join Date: Jun 2011
Location: Saskatchewan, Canada
Posts: 292
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Quote:
Originally Posted by MrJoe
With today's electronic systems, the octane is dictated by the computer's setup (tune). If it's factory stock and the owners manual says 87, that's what to use. I have also seen worse mpg running higher octane.
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Exactly.
People who run high octane fuel when the vehicle or tune does not ask for it are just throwing away money.
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05-04-2014, 07:00 PM
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#15
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Guest
Join Date: Jun 2013
Posts: 273
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Quote:
Originally Posted by pappcam
Exactly.
People who run high octane fuel when the vehicle or tune does not ask for it are just throwing away money.
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X2
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05-04-2014, 07:17 PM
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#16
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Senior Member
Join Date: Feb 2013
Location: Ottawa ON
Posts: 111
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US Gov site on octane.
CBC Marketplace test on fuel.
However adding ethanol in regular gas muddies the water and the engine ... Not many retailers use a mix of ethanol in regular gas here.
__________________
2009 Suburban LT 1500 - 4x4 - 3.42
2009 Flagstaff 23FBS Super Lite
Nights Camped in 2015 - 21
Nights Camped in 2014 - 29
Nights Camped in 2013 - 31
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05-04-2014, 11:40 PM
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#17
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Anacortesians
Join Date: Oct 2010
Location: Anacortes, WA
Posts: 1,166
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Modern (since maybe 2000) engine computers sense whether there's any knocking on lower octane fuels and adjust ignition and injector parameters appropriately. I get about 8 mpg on my MH and it doesn't seem to matter what grade I use, so I get the cheapest.
On less than 5000 miles in a typical season, the difference in cost vs. fuel burned wouldn't be visible. If I was full-timing and driving 20K a year, I'd do a more detailed study. Most of the time we fill up at Costco, Safeway or tribal gas stations, since they're usually 5 cents or more chaeaper than the big names.
__________________
Frank and Eileen
No longer RVers or FR owners
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05-05-2014, 06:28 AM
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#18
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Quote:
Originally Posted by beerjay
A CBC consumer show did an independent test of gas types last year and televised the results for various vehicles.
They used test gear for mileage and emissions as well as mechanical inspections. The high octane produced worse gas mileage and created more emissions than the regular gas. This is because the computers in the vehicle are set for a specific octane that is specified in the user manual. In some cases they noted worse performance on the road with the high octane since the computer was not set for it.
Some performance cars require higher octane but that will be specified in the user manual.
I think in the days of coils and mechanical carbs higher octane could be usefull.
Higher octane myths are fueled <g> by gas stations and gas companies since it costs the consumer a lot more.
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This is false.
The computer adjusts according to "engine knock" to give the proper air fuel ratio and timing.
There "not set" to a pre determined octane ratio.
This is just silly.
TURBS
Sabre owners united!
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05-05-2014, 06:29 AM
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#19
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Quote:
Originally Posted by acadianbob
I don't think that this is so true anymore. In the quest for more power out of smaller displacement engines and better fuel economy, most modern engines have very high compression ratios. Ratios this high would have absolutely required high octane fuel to prevent detonation in the old days.
In today's world of variable cam timing and variable timing advance, one can use 87 octane in high compression engines. The ECM manages all of this with detonation sensors to get maximum performance for the fuel and load conditions.
So, there CAN be some benefit to higher octane fuels in many engines. This allows more advance; giving higher performance and economy. This is especially true in turbocharged or supercharged engines.
I've monitored the timing advance on my F150 with a ScanGaugeII. I can tell you that the ECM is constantly changing the timing. And when I tow, I can definitely tell the difference between 87 and 91 octane on the truck's ability to hold 6th gear on uphills. It runs fine on 87 and doesn't detonate. But there is a performance difference when running 91.
My turbocharged VW Jetta is definitely faster with 91 and gets about 10% better fuel economy. Why? On 87 it pulls a lot of timing to prevent detonation.
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You are correct!
TURBS
Sabre owners united!
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05-05-2014, 06:58 AM
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#20
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Infractee
Join Date: Aug 2010
Posts: 796
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Always has been lots of misinformation on octane. People have always assumed higher octane means more power when in reality the higher the octane number the SLOWER the fuel burns so that pre-ignition does not occur before the spark plug fires. (Ala a diesel ignition) a car designed for 87 using higher octane cannot fully burn the fuel/air charge resulting in raw fuel going out the exhaust valve. using higher octane fuel than required is a waste of money and will eventually kill your catalytic converter due to unburnt fuel constantly being fed to it.
Don't believe me, look it up,all the info is out there.
All the anecdotal stories in the ether mean nothing next to the hard science.
Sent from my SAMSUNG-SGH-I337 using Forest River Forums mobile app
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