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Old 05-21-2019, 09:43 AM   #1
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Why is the V-10 such a Gas Hog?

I had a 2005 18,000 Lb Workhorse with the 8.1 Ltr GM engine. I got between 7 and 10 MPG even pulling a toad or boat back and forth across the Rockies.

Then I sold it and bought a 2018 13000 LB CL C with the V-10. I was expecting 13 MPG with that light weight. Nope, 1st trip from Denver to SD Badlands and Deadwood, Devils Tower , Wind Cave, no toad, relatively flat land as compared to crossing the Rockies, Oh my 6 MPG.
I really did not like the CL C after being used to a CL A so I traded it for a 16,000 LB 2018 Georgetown. 6 MPG.

The newer cars are very peppy and get way better MPG than the older cars so that was all the more reason I thought the V-10 would be more gas efficient.

Other than that, I like the V-10, it seems to have a lot more power than the 8.1 Ltr V-8, it even sounds like a race engine when accelerating, even to it's 75 MPH speed limiter , the GM was 80 MPH limited, but dang , it is a gasaholic.

My son has a 4 door F-250 loaded pulling a 8000 LB trailer with a 6,2 L gas engine and gets 9 to 12 MPG

Also puzzling is that little 13000 lb CL C got about the same mileage as the big 22 and 24,000 LB Rvs.

Is there any logical explanation for this?
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Old 05-21-2019, 10:19 AM   #2
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Aerodynamics, not weight, is the biggest factor in fuel economy, in my experience.
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Old 05-21-2019, 10:30 AM   #3
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Quote:
Originally Posted by steve52 View Post
Aerodynamics, not weight, is the biggest factor in fuel economy, in my experience.
Aerodynamics and vehicle speed pretty much govern fuel economy at highway speeds. Resistance of the air (drag) goes as the square of velocity so going 70 mph rather than 60 should result in a ~35% increase in drag.
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Old 05-21-2019, 11:36 AM   #4
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How do you spell excessive speed?

We've been across the U.S. 17 times. There is 118,000 miles on the odometer.
We constantly average 8 mpg driving 60 to 63 mph.
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Old 05-21-2019, 11:39 AM   #5
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Weight, wind resistance, rolling resistance, and oh yeah 10 cylinders.
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Old 05-21-2019, 12:27 PM   #6
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True, but my other MH with the 8.1 ltr egine had more weight and just as much wind resistance but only had 8 cylinders; however they were much bigger cylinders.
I know all about the 62 MPH majic speed #, I've been around here a long time so I don't need the speed preachers looking down on me.
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Old 05-21-2019, 12:46 PM   #7
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Two of us in two similar Mohos drove from Ontario, Canada to Apache Junction and return last winter. 5500 miles
Mine an 09 GM his 13 Ford. All fill ups were within 5 dollars of each other.
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Old 05-21-2019, 12:50 PM   #8
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Two of us in two similar Mohos drove from Ontario, Canada to Apache Junction and return last winter. 5500 miles
Mine an 09 GM his 13 Ford. All fill ups were within 5 dollars of each other.
Hmm, that's interesting and a very good comparison. My Georgetown only has 2100 miles on it, maybe it will get better with some more exercise.
But my CL C had 7000 miles and it did not seem to get any better.
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Old 05-21-2019, 12:56 PM   #9
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If you want them ponies to pull the wagon ya gotta feed em. And they like good quality hay. Not that watered down stuff made from corn.
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Old 05-21-2019, 02:36 PM   #10
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Gotta pay to play.
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Old 05-21-2019, 03:11 PM   #11
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The GM 8.1 is a modern LS based engine design with very efficient cylinder head (cathedral style intake ports) and quite possibly better "stock" computer tunning and transmission shift point/firmness all of which contribute to better milage. I installed the 5-Star tune on our 2015 ACE 29.2 and got a consistent 1 mpg improvement in addition to overall improved power and shifting, but even then only averaged between 8-9 mpg (keeping speeds below 65).
My friend with a much larger 2006 38' RV with the 8.1 was never light on the throttle, flying past everyone and always got over 10 mpg. I hated him...
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Old 05-21-2019, 04:26 PM   #12
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Hmmm again. I always thought the Ford V-10 was a more modern engine than the GM 8.1. Maybe that's why I got considerably better mileage with it.

I never had any trouble with my 496 GM engine until the crank shaft broke in 3 pieces on I-70 before the tunnels with 24.000 miles on it. That cost $14,000for a new engine. Then I sold the MoHo with 48,000 miles before it could do it again.
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Old 05-21-2019, 05:21 PM   #13
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It will be interesting to see how the new 7.3 gas compares when it makes its way onto the F53. As for the 6.8 I got around 3.7mpg crossing the Rockies in a head wind, and 8.2 creeping up Hwy 99 in Ca at 55mph just to see what would happen. So, speed, wind resistance - the usual.
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Old 05-21-2019, 06:29 PM   #14
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The entire industry is adding more and more shift points to the auto tranny. My Nephew is an engineer at the Ford F-150 plant. When he told me Ford was looking at a 10 speed I asked why? Simple answer is better fuel economy.

Also consider this. All engines are being controlled by a PC and the fuel ratio is maintained at 14.7:1 most of the time and it is the ideal mixture. There's no more choke which had a 7:1 air fuel ratio. The fuel is precisely measured and delivered inside the combustion chamber to achieve high efficiency.

The industry is always looking at many things to improve and meet CAFE standards. But the down side is the RV chassis being sold by Ford is just a small percentage of the CAFE averages so they don't have to make improvements.

The CAFE averages are why there are still a small number of high performance vehicles being made. As long as they meet the average of what they sell they can make some gas hogs. Those are performance cars and RV's.
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