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Old 05-02-2014, 10:42 PM   #1
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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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Old 05-02-2014, 10:50 PM   #2
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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.
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Old 05-02-2014, 10:58 PM   #3
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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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Old 05-02-2014, 11:39 PM   #4
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I've been told there's no benefit to running higher octane gas than what the compression ratio of your engine dictates.
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.
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Old 05-03-2014, 06:52 AM   #5
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Higher the octane the better the fuel mileage.
The increase in fuel mileage pays for the difference in cost.

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Old 05-03-2014, 07:33 AM   #6
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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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Old 05-03-2014, 08:38 AM   #7
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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.

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Old 05-04-2014, 01:50 AM   #8
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Higher the octane the better the fuel mileage.
The increase in fuel mileage pays for the difference in cost.

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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.
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Old 05-04-2014, 02:36 AM   #9
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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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Old 05-04-2014, 07:19 AM   #10
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Higher the octane the better the fuel mileage.
The increase in fuel mileage pays for the difference in cost.

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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.

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