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Old 01-21-2020, 09:52 PM   #1
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The Verdict is in, New Ford 7.3 V-8 Gas mpg not so Great

5.5 to 6.1 mpg while pulling a load, looks like the new 7.3 V-8 gets about the same mpg as the 6.8 V10..

Different motor same mpg, looks like the gas motorhomes are still stuck with bad mpg..

https://youtu.be/qbXFrZsiAQE


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Old 01-21-2020, 10:20 PM   #2
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Dang. This isn’t what we had hoped for.
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Old 01-21-2020, 10:57 PM   #3
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Well,
This is not to be taken as any form of condescending or in any words, belittling but, why, would anyone think that ANY motor, in any MOTORHOME get anywhere near any form of GOOD gas mileage? No matter if it's a new gas motor, old gas motor, diesel motor or what. And especially if one tows any form of a heavier toad, Jeep, truck, Grand Cherokee etc. For gas coaches, even the lighter toads, i.e. Suzuki Samurai, Geo Tracker, VW, Smart car etc. will even effect mileage.

Folks, these are rolling gymnasiums. They've got about as much aerodynamics as a planet. And for at least some portion of driving, your foot's nailed to the floor to go up grades, fight headwinds or both so, mileage at that point is pure ZERO. It kind-a is what it is.
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Old 01-21-2020, 11:27 PM   #4
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Fire Up :

It would still be nice if they could at least produce a big block that was not a gas hog, I mean even 9-10 mpg in a gas motorhome would be a great improvement but it seems after 30 years the mpg in motorhomes have gone no where..
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Old 01-22-2020, 12:25 AM   #5
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I think the mpg will be better in a Class A than in a truck pulling close to max load. It's quite possible that the new engine has improved fuel economy, but it could be small, say in the range 5 - 10%, in which case it will be difficult to observe unless you take two identical motor homes, one with the old 6.8L and one with the new 7.3L.
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Old 01-22-2020, 03:06 AM   #6
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I understand the concern about fuel mileage. I'm on somewhat of a tight budget myself. I wish my gasser got better mileage like everyone else does. However, as someone else has said, it is what it is. I did the research and knew what I was getting into. Even though gassers get lousy mileage, it is STILL the cheapest way to travel. If you're gonna play, you're gonna pay. If you can't afford it, stay home and watch the travel channel!
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Old 01-22-2020, 05:08 AM   #7
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If I got The SAME mileage PLUS much improved driving dynamics I would be perfectly happy.
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Old 01-22-2020, 05:26 AM   #8
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The shape, efficiency and weight of the motorhomes is the larger part of where we can have an impact on mileage. Fuel holds energy and you can't change the amount of energy it takes to move something.

I think expecting more than a 5% improvement is asking a lot.
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Old 01-22-2020, 06:32 AM   #9
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Quote:
Originally Posted by Rolling Ragu View Post
The shape, efficiency and weight of the motorhomes is the larger part of where we can have an impact on mileage. Fuel holds energy and you can't change the amount of energy it takes to move something.

I think expecting more than a 5% improvement is asking a lot.

I would be VERY happy with 5% improvement with better driving dynamics (better low-end torque and shift management improvements)
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Old 01-22-2020, 06:51 AM   #10
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That’s significantly WORSE mileage than we got with our 6.8 traveling at 26k lbs. And they tested a pickup with a horse trailer, which is much more aerodynamic compared to a coach towing the pickup truck.

Ever since this engine was announced people have been waiting anxiously to see the “improvements”. Well, now you have. It’s the old 460 gen II.

Why anyone, including the Ford engineering department, believes a return to older design is a good thing, is beyond me.

The Triton OHC design already dominated the GM big bore and killed it. Now Ford has adopted the same philosophy as GM.
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Old 01-22-2020, 09:13 AM   #11
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Quote:
Originally Posted by stvdman View Post
I would be VERY happy with 5% improvement with better driving dynamics (better low-end torque and shift management improvements)
As would I!
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Old 01-22-2020, 09:15 AM   #12
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Aero and weight.
That, combined with the fact modern gasoline engines are about 28% efficient at most.
You will never see 9-10 from a gas class A.
Aero drag is #1 killer.

Quote:
Originally Posted by jackreno View Post
Fire Up :

It would still be nice if they could at least produce a big block that was not a gas hog, I mean even 9-10 mpg in a gas motorhome would be a great improvement but it seems after 30 years the mpg in motorhomes have gone no where..
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Old 01-22-2020, 09:23 AM   #13
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Anybody hoping for noticeably better mileage from new a gas engine (or any engine) pulling or pushing a massive box on wheels down the highway is asking to be disappointed. The air resistance by itself prohibits GOOD mileage. If I get over 8, then great. Less than 7, well poop. I do what I can do in regards to tire pressures, limiting speed, managing weight without going anal.
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Old 01-22-2020, 09:31 AM   #14
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I don't think this video of a truck & 40' trailer doing 70mph with different drag characteristics is a good barometer for what MH's may see. In our 2012 V-10—last years controlled travel test—we got 7.3mpg over 1000's of miles of assorted terrains and we always are towing and in tow haul mode. I'm happy with 7.3 with our 25K GCWR vehicle.

Poor mileage should not even be in a conversation when talking about large RV's IMO. It is what it is.

Besides there is a plethora of other things that can contribute to better or worse mileage than just the engine.
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