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04-19-2011, 10:10 PM
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#1
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Senior Member
Join Date: Nov 2010
Posts: 312
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Mpg {gasp}
First short trip, about 120 miles. MPG worked out to 3.45. I think that something may be wrong.
I've read that these fords can get horrible gas millage if the O2 sensor is out of whack. Anyone have experience with very poor gas millage.
Coach drives will, maintains 65 without apparent effort.
Tires are all at pressure on spec sheet (90 psi)
No fuel leaking that I can find.
Air filter looks clean.
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2008 Georgetown SE 350DS BunkHouse
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04-19-2011, 10:22 PM
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#2
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Senior Member
Join Date: Jan 2011
Posts: 268
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Was it east coast this past weekend? That storm put me in a 20+mph headwind all day Sat and got 8.5 towing. Next morning, no wind and 10.5 and i gained weight from groceries
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2011 F-350 SRW Lariat FX4
2014 Sandpiper 365SAQB
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04-19-2011, 11:26 PM
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#3
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Moderator Emeritus
Join Date: Nov 2008
Location: Winston-Salem, NC
Posts: 2,381
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Probably nothing wrong. Did you fill the coach before you started? I mean fill it till the pump cut off three times? Was the coach level when you filled it? Now you drove it and filled it again, Same questions, pump cut off three times and level? Since it is a 2008, it is OBDII computer, and if you had an O2 sensor out of whack, you would have a "check engine" light. The tanks are really flat for ground clearance, and a few degrees out of level can be several gallons of fuel. Keep records over 5 tank fill ups, then see what you have.
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LadyWindrider
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT
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04-20-2011, 01:12 AM
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#4
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Member
Join Date: Sep 2009
Location: West Coast of Canada
Posts: 81
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On mountain terrain, I can average about 7mpg. On flat ground, I usually get around 8mpg or higher. This is with towing a Honda CRV with a 2007 Georgetown 359TS. You really need to check your mileage.
Hankster
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04-20-2011, 11:15 AM
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#5
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Anacortesians
Join Date: Oct 2010
Location: Anacortes, WA
Posts: 1,166
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Our signature rig (01 F53 chassis with V-10) gets a regular 7.6 mpg. I keep a tally of gallons purchased and then gas up just before home at the Swinomish Tribal station, usually at the same pump, so I'm fairly sure the trip average is pretty accurate.
On my old 26' Class C, with a carb-equipped Ford 460 and enough smog gear to gladden Rube Goldberg's heart, we got about 6 mpg at sea level and 4.5 at altitude.
BTW, we don't tow.
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Frank and Eileen
No longer RVers or FR owners
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04-20-2011, 11:29 AM
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#6
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Senior Member
Join Date: Jun 2010
Location: SUNSHINE STATE
Posts: 1,769
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AH-HA, I thought mi--------
AH-HA, I thought my mileage was bad at 50-55 MPH at 9.5-11.5 MPG towing a 8285 WS with a 5.4 L Ford.
After reading this, mine makes gas going down the highway.
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Sid & HRH MISSY, SHIH TZU
2019 WILDCAT 28 SGX
2014 F-250 KING RANCH PS 6.7L/SWD/6R140/BFT
TST Truck System Technologies TM-507SE
DAYS CAMPED 2023 69 DAYS
[SIGPIC][/SI[SIGPIC]
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04-20-2011, 12:08 PM
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#7
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Senior Member
Join Date: Mar 2008
Location: Jacksonville Florida
Posts: 1,264
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I get 7.5 to 8 mpg on the highway at 60/65 avg. in flat Florida with a 5.7 Hemi Dodge Ram 1500'. If I did 50/55 mph, I'd get creamed out here on I-95! Randy
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/SIGPIC]'08 V-lite Flagstaff 30WRLS
'06 Ram 1500 QC hemi Reese dual cam sway control,
K&N series 77 intake, Hellwig helper spgs. LT tires,
Flowmaster "true duals", 380 h.p., Bilstein shocks
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04-21-2011, 01:46 PM
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#8
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Anacortesians
Join Date: Oct 2010
Location: Anacortes, WA
Posts: 1,166
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Follow-up with additional info - with round trips of relatively short duration (7 to 12 days is typical) whatever gradient and wind effects influencing mileage are usually cancelled out. We cross the Cascades both ways on most trips, we drive in the higher altitudes east of the mountains (lower drag at 1500' than at SL) and EFI seems to do a much better job of mixture control with altitude than the old rig's carb did.
Very strong headwind component does reduce mpg, but a tailwind going the other way more or less cancels it out.
__________________
Frank and Eileen
No longer RVers or FR owners
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04-21-2011, 02:29 PM
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#9
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Senior Member
Join Date: Nov 2009
Location: Dahlgren VA
Posts: 317
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There was a lot of good information out there. I do the same and make sure the tank is full if I am going to check the millage. Our 08 gets around 7-8 traveling on hilly to flat ground towing a Escape. We went across the country last year to Calif and back and averaged right around 8.
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Ken and Velda
Dahlgren, VA.
2008 Georgetown XL 378
2010 Ford Escape Limited
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05-01-2011, 09:17 PM
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#10
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Senior Member
Join Date: May 2010
Location: Montrose, Colorado
Posts: 101
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We're mostly making short trips this summer. We're fortunate to be in such a beautiful area. Other than our spring trip to Moab Utah, our longest will probably be from Montrose to Durango, Colorado. I made a test run this weekend with a UHaul truck over Red Mountain, Molas and Coal Bank Passes. I was a little apprehensive taking our Georgetown that route to Durango but I know I can do it now. As for gas mileage it ain't gonna be pretty!
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05-02-2011, 11:49 AM
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#11
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Pete
Join Date: Jun 2009
Posts: 169
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Mileage is ugly for sure when doing Red Mountain from Ouray to Silverton.
Be SAFE!
When I did it, driving "UP' the mountain and navigating the turns wasn't bad. It was the coming "DOWN" that bothered me. LOWER gear for sure! But, I still used the brakes and they really heated up and start smelling. I pulled off two times to let them cool down; and then travelled on. We were towing a 2008 Jeep Liberty.
I assume you don't have many miles on your brake pads, or you haven't done many mountain decensions to use/ride your brakes. If so, you may want to check the brake pads.
Happy and Safe travelling to you!
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[FONT="Comic Sans MS"][B]Pete and Patty
2019 Forester 3011DS; 2016 Jeep Grand Cherokee Overland
Lab/Catahoula/Greyhound rescue
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05-02-2011, 12:05 PM
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#12
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Member
Join Date: Nov 2008
Location: National Park, New Jersey
Posts: 92
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I have an 08 378XL towing a Jeep Cherokee I get 7.5 to 8 mpg, of course that's all down hill with the wind in my back and my wife pushing for good measure. All in all if you get 7 to 8 you are doing the same as everyone else.
Remeber these are not our evey day driver's.
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06-27-2011, 12:34 AM
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#13
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Senior Member
Join Date: Nov 2010
Posts: 312
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Filled up for the second time today. 7.16mpg this time. Better then that 3.5 of last time. No idea what happened that first time.
Maybe the locking gas cap was the key?
350DS has a 75gal tank. With the gauge indicating 1/2 tank I put in 46.738 gallons. I guess that the gauge isn't right on eh?
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2008 Georgetown SE 350DS BunkHouse
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06-27-2011, 06:18 AM
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#14
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CLASS "A" Senior Member
Join Date: Nov 2008
Location: Upperco, Maryland
Posts: 3,136
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Quote:
Originally Posted by jsutherl
Maybe the locking gas cap was the key?
350DS has a 75gal tank. With the gauge indicating 1/2 tank I put in 46.738 gallons. I guess that the gauge isn't right on eh?
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The Locking Gas Cap was one of the first things I bought once we got the coach home. I'd didn't want to become the filling station for anyone out there looking for free gas.
Gas gauge is pretty close but I don't believe any are exact. Ever notice how long it takes to come off "FULL" but then how quickly it drops after it reads "1/2" ?
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2007 Georgetown 370TS
aka - RAYNMKR
Driver: Charlie
Navigator: Sheri
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06-27-2011, 06:48 AM
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#15
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Site Team - Lou
Join Date: Oct 2009
Location: South Eastern PA
Posts: 23,269
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1) Fuel gauges are electronic sending units that rely on mechanical systems to provide the information they send.
2) Fuel tanks are not symmetrical but are shaped to fit in the assigned space.
3) It is not possible for a mechanical arm with a float on the end to travel from the top of a weirdly shaped tank to the bottom and register the same amount of fuel through it's entire range of motion.
4) The attached photo is a custom shaped F-350 gas tank. Picture an arm inside going up and down as you use fuel. Since there needs to be room for the arm to reach the bottom, the float will stop its upward movement well before the tank is full and will be submerged until the fuel drops low enough to start indicating. (Gauge reads "full" for a LONG time)
5) Depending on the shape of YOUR tank, it might take several gallons to even show you used any gas. Then drop quickly, hang out there a while and run on "empty" forever.
6) Electronic DIC (driver information center) computer systems do not care about what is in your tank. They monitor your ENGINE and display fuel USED as you drive. If you have a 36 gallon tank you can watch every drop leave regardless of its shape. The DIC in my GMC Sierra is right dead on and at places where I have to pre-pay for diesel I look at the DIC; multiply by the price per gallon and have never missed my pre-pay.
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Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
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06-27-2011, 07:52 AM
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#16
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Senior Member
Join Date: Dec 2010
Location: Regina, Saskatchewan
Posts: 310
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Our first trip in the 2011 360 gave us 7.5 mpg. That is about normal.
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06-27-2011, 02:34 PM
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#17
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Senior Member
Join Date: Nov 2010
Posts: 312
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Quote:
Originally Posted by herk7769
1)Electronic DIC (driver information center) computer systems do not care about what is in your tank. They monitor your ENGINE and display fuel USED as you drive.
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I wish the ford gave this kind of information. Aside from the gauges I get odometer, one trip meter and engine hours. That's it.
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2008 Georgetown SE 350DS BunkHouse
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06-27-2011, 09:03 PM
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#18
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Senior Member
Join Date: Oct 2006
Posts: 1,630
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How often was the generator running on the first trip? 7-8 mpg is about right for a Ford V-10 hauling a load.
__________________
2012 Georgetown XL 350TS, Hellwig front/rear sway bars, Sumo Springs, Blue OX True Center steering damper
2013 Ford Explorer LTD toad, Roadmaster Stowmaster 5000, VIP><Tow Brake
Better to have a bad day of camping than a good day at work!
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06-29-2011, 09:16 AM
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#20
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Senior Member
Join Date: Jun 2009
Location: Colorado
Posts: 322
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Most of you are getting better than me. I get around 6.5mpg towing a car (25,500#s), and a little over 7mpg if I dont.
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Ron Hanson
2009 Georgetown 350TS (bunks)
400W solar, 440AH 6V GC2
2009 Ford Edge AWD Ltd towed
2011 Honda Fit Sport towed
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