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Old 04-19-2011, 10:10 PM   #1
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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.

2008 Georgetown SE 350DS BunkHouse
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Old 04-19-2011, 10:22 PM   #2
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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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Old 04-19-2011, 11:26 PM   #3
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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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Old 04-20-2011, 01:12 AM   #4
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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.
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Old 04-20-2011, 11:15 AM   #5
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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.
Frank and Eileen
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Old 04-20-2011, 11:29 AM   #6
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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.
Sid, Lois & HRH MISSY Terrible 2s SHIH TZU
2011 ROCKWOOD 8285 WS
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Old 04-20-2011, 12:08 PM   #7
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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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Old 04-21-2011, 01:46 PM   #8
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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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Old 04-21-2011, 02:29 PM   #9
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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.

Ken and Velda
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2008 Georgetown XL 378
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Old 05-01-2011, 09:17 PM   #10
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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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