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Old 01-13-2022, 11:56 AM   #1
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Real world truthful gas mileage

I'm looking for a thread or forum where people will list their Truthful gas mileage. Not exaggerated manufacturer claims or people quessing at it. I mean actual miles trav eled by gallons used, digital gas computers on the istrument panels don't count. They are guestimations.
Does anyone know if a thread or forum exists?
I tried searching for gas mileage but didn't find any info, perhaps I'm searching wrong?
Thanks
Danford1
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Old 01-13-2022, 12:01 PM   #2
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I have kept track of our mileage the last few years, and we have averaged right at 6.0 miles per gallon.

I have a 8.1 GM engine and 5 speed Allison transmission.
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Old 01-13-2022, 12:19 PM   #3
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I have kept a log book from the day we bought our coach recording date, miles, gallons, and cost. While the lowest mpg was just over 5 mph, that was a lot of stop and go in hilly terrain. On the average I get 7.5 mpg flat towing on the open road. Occasionally I get over 8 mpg. My engine is a 450 Cummins.
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Old 01-13-2022, 12:23 PM   #4
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May be one but I don't know of a thread around here. Maybe this'll be the one!

Our smallish 28 foot class A with the 8.1 averages about 7.5 mpg. The driving computer seems to always show better but the above number is with my own calculations. Not many hills around here and we usually pull a 17 foot bass boat.

Edited to add: We usually keep speed around 60 and rarely exceed 65.
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Old 01-13-2022, 12:26 PM   #5
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Might get more accurate answers if you let us know what type of RV setup you’re interested in. Gas/diesel tow truck, gas/diesel MH? I not sure too many are providing inflated mileage numbers but some may have trouble with math? ;-)
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Old 01-13-2022, 12:31 PM   #6
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Gas mileage is a ridiculous thing to calculate for a recreational vehicle as most folks do it wrong. Anyway, if cost is a concern, my real work cost per day is $100.00 and that's with my Hurricane and Kia Soul dinghy.
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Old 01-13-2022, 12:36 PM   #7
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38 foot motor home with Cat C7. 6.7mpg over 119,000+ miles traveled.
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Old 01-13-2022, 12:41 PM   #8
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Quote:
Originally Posted by Danford1 View Post
I'm looking for a thread or forum where people will list their Truthful gas mileage.
Truthful gas mileage for what?
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Old 01-13-2022, 12:44 PM   #9
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Just got back from a trip from MN to NC going about 1200 miles. Averaged between 7.5 and 8. 350hp on a 36 foot diesel Winnebago Journey. We were not pulling the Jeep.
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Old 01-13-2022, 12:51 PM   #10
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40' DP coach, running around 31k, Cummins M11 450hp, not towing, averages around 7-7.5mpg. Worst was 4.9, best was 9.0.
Generator is Diesel, and runs 1/2 - 1 gph depending on load. I do run the gen going down the road when it's hot so I can use the coach AC.
Biggest influence on mpg is how you drive. My engine peak torque is at 1700 rpm, so I set the cruise so I can run that, which puts me around 62mph. Driving faster really drops the mpg.
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Old 01-13-2022, 12:53 PM   #11
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Not sure how you think computers make "guesstimates". Modern fuel injected engine computers know precisely how much fuel the engine is using, that's their main purpose and what they do to make the engine driveable and usable. Sometime in the late 1970's, automotive engineers noted that since they were measuring that anyway, why not calculate that against the miles traveled and display the result to the customer? Starting with premium vehicles. I had 1986 Ford that had the optional fuel/trip display and found its averages to be amazingly accurate. Yes, you can play silly buggers with the "instant" mileage for some fun results that don't mean anything, it's the long term averages like miles per tank that count.
1986 was very long time ago. Pretty sure technology has progressed slightly since then and I imagine the accuracy improved a tad along with it.
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Old 01-13-2022, 01:00 PM   #12
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Quote:
Originally Posted by RetiredbutWorking View Post
Gas mileage is a ridiculous thing to calculate for a recreational vehicle as most folks do it wrong. Anyway, if cost is a concern, my real work cost per day is $100.00 and that's with my Hurricane and Kia Soul dinghy.

It's not ridiculous at all. I want to know what my range is. I want to know if I can pass on stupidly priced fuel, and comfortably reach fuel at better prices.
I know there are a lot of people saying fuel is just the cost of doing business, and that is true. But I see no shame in reducing that cost. Every dollar I can save on fuel burn is another dollar for repairs, upgrades and maintenance.
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Old 01-13-2022, 01:18 PM   #13
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'93 28' Class C. Ford 460. Target speed is 65.

8mpg over the last 20k miles, except 7.5mpg when towing 2000lb trailer.
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Old 01-13-2022, 01:25 PM   #14
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Our 2002 Windsor 40PBT averages about 8 MPG. It has a Cummins ISC350 engine.
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