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Old 09-11-2021, 02:03 PM   #21
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Of course, it all depends on several conditions.. level roadway.. 11-13 MPG @ 60 MPH, no towing.. some hills & traffic ... 7-9 MPG.. I'm very pleased with the performance on the hills.. so, my average is around 10 MPG..

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Old 09-11-2021, 02:35 PM   #22
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Although the attached is for my rig which is a 6.7 Cummins does anyone have something similar for the Ford engine?

My actual Fuel Log for the year stopped a lot of inflated numbers from being posted on another forum and provided a potential buyer a more realistic expectation of a Freightliner Super C’s mpg.

As a note the log covers travel through numerous states and terrains to include the Yellowstone area.

Fuel Log.pdf
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Old 09-11-2021, 03:09 PM   #23
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From my experience any E series Ford, also F series except the diesel, with a V8 or V10 if you get 10 mpg you're good, most average 8-9 mpg unless you're willing to creep along about 45-50 mph.
You don't buy RVs for the fuel mileage, they're to keep you out of hotels or staying where no man has gone before.
If the mpg is too much concern buy a Prius that you can travel at posted speeds, if a Prius will run that fast, get 30+ mpg & stay in hotels.
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Old 09-11-2021, 03:19 PM   #24
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My Ford V10s in a Class C and a Class A never got over 9 unless they were going downhill regardless of whether or not we were towing. We were lucky to get 8 on flat lands and more likely to get 7 or 7.5 around the Mid-Atlantic region. We never, in the 10 years with both rigs, got over 9 during normal driving at an average of 60 MPH.
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Old 09-11-2021, 05:11 PM   #25
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I have the F-550 chassis with the 6.7 Powerstroke diesel engine. On several trips since March, I have used Trip 1 and Trip 2 to keep track of average fuel. Trip 1, I reset at each fill up. Trip 2, I reset at the beginning of a trip and check it when we get home after the trip. On an approximately 4000 mile trip out west (up and down the Rockies) we averaged 9.6 MPG. On a recent 2000 mile trip east, I averaged 10 MPG. On individual fillups, I have seen as high as 11.2 and as low as 8.6 MPG. I tend to set the cruise at 65 on the highways. Seems to be in the same range as others that have posted here.
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Old 09-17-2021, 10:26 AM   #26
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I tried a few variations with tire pressures and, either the Motorhome, Toad and both.
Motorhome door tag calls for 80R & 75F. Tried to lower 5 lbs and reduced MPG by about 1-2.
Also had the Ford Ranger at the door tag at 30 lbs. Also killed mileage.
I now have the Motorhome set at the specified pressures and the Ranger at 45 on all tires. Max on tires is 51 lbs. My last trip I got 8-1/2 mpg driving at 60 mph.
I'll take that.
The moral of the story is, the V10's mpg is very dependant on speed and pressures, both the Chasis and the toads.

I did notice that with the V10, Ford had two versions of engine, one for class A's and one for C's.
The V8 uses the same engine. Strange.
Both advertise 350 HP and 468 Torque.
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Old 09-17-2021, 01:50 PM   #27
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Originally Posted by CHS View Post
I tried a few variations with tire pressures and, either the Motorhome, Toad and both.
Motorhome door tag calls for 80R & 75F. Tried to lower 5 lbs and reduced MPG by about 1-2.
Also had the Ford Ranger at the door tag at 30 lbs. Also killed mileage.
I now have the Motorhome set at the specified pressures and the Ranger at 45 on all tires. Max on tires is 51 lbs. My last trip I got 8-1/2 mpg driving at 60 mph.
I'll take that.
The moral of the story is, the V10's mpg is very dependant on speed and pressures, both the Chasis and the toads.

I did notice that with the V10, Ford had two versions of engine, one for class A's and one for C's.
The V8 uses the same engine. Strange.
Both advertise 350 HP and 468 Torque.
The 362 HP V 10 generates too much heat for the enclosed hood area of the E series.
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Old 09-17-2021, 01:51 PM   #28
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Originally Posted by CHS View Post

.....cut....

I did notice that with the V10, Ford had two versions of engine, one for class A's and one for C's.
The V8 uses the same engine. Strange.
Both advertise 350 HP and 468 Torque.

The V10 was manufactured with different heads; one had 3 valves per cylinder and the other 2 valves per cylinder. The more powerful 3V engine never made it into E-Series — reportedly because it was wider and didn’t fit, and or it created more heat than the E-Series could handle under the tight engine doghouse.

The new 7.3L V8 is manufactured with 3 different power levels, although the engines are similar as far as I can tell. The most powerful rating is for pickups only, where it achieves 430 HP at 5,500 RPM and 475 lb-ft of torque at 4,000 RPM.

For all large truck applications, power is limited at 3,900 RPM, hence 350 HP and 468 lb-ft (both at 3,900 RPM).

However, for the E-Series Cutaway and Stripped Chassis only, Ford offers the 7.3L in an Economy tune where it makes 300 HP at 3,750 RPM and 425 lb-ft at 3,250 RPM.

As far as I know, no RV manufacturer is offering the lower-cost “Economy” tune. It would be interesting to know if it actually saved fuel versus the standard 350 HP engine.
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Old 09-17-2021, 03:12 PM   #29
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I flipped through the manual of our 2021 Ford Axis 24.1 which is built on the E350 chassis. No where does it give the hp of the engine(s). I had assumed that for this somewhat light (12,500 lb GVWR) chassis it was supplied with the 300 hp engine.

David
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Old 09-17-2021, 03:33 PM   #30
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All my MPG is based on fill up to fill up math. With rare occaision is 9.7 to 10.4 with v-10 vvegas e450. My buddy with fourr winds no slide model e450 same.

Last October going from Tenn to NC across blue ridge 6% grade we dropped to 8.75. That is the only time a tank was under mid 9s. I was also dragged a 5300 open double axle trailer with drag car. The trailer has virtually no net impact on MPG for us. I had expected better with trailer but always within .2 or .3 MPG.

I have heard great things about v-8 but no enough to replace ours at current prices.
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Old 09-17-2021, 03:48 PM   #31
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Originally Posted by DavidEM View Post
I flipped through the manual of our 2021 Ford Axis 24.1 which is built on the E350 chassis. No where does it give the hp of the engine(s). I had assumed that for this somewhat light (12,500 lb GVWR) chassis it was supplied with the 300 hp engine.

David

I recall seeing 350 HP advertised but during a quick look today didn’t see power rating. Maybe I missed it. It would be interesting to check VIN to see if some of the high MPG reports are based on “Economy” tune and or 4.10 gears.


What I would like to see in E-Series is an inline 6 cylinder 5.5L version of V8. That would be more efficient and allow a much narrower doghouse for added leg room.
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Old 09-17-2021, 11:23 PM   #32
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Quote:
Originally Posted by DavidEM View Post
I flipped through the manual of our 2021 Ford Axis 24.1 which is built on the E350 chassis. No where does it give the hp of the engine(s). I had assumed that for this somewhat light (12,500 lb GVWR) chassis it was supplied with the 300 hp engine.

David
The 8th character of the VIN identifies the engine. My 2022 Vegas is on a 2021 Ford E350 with 7.3L premium 350 HP and the 8th character of VIN is "N".

https://www.fleet.ford.com/content/d..._VIN_Guide.pdf

The 300HP 7.3L economy 8th character of VIN would be "K".


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Old 09-17-2021, 11:54 PM   #33
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OK, my VIN also has an N, so it seems I have the 350 hp engine as well.

Thanks, David
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Old 09-18-2021, 12:38 PM   #34
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Quote:
Originally Posted by RCS View Post
I have the F-550 chassis with the 6.7 Powerstroke diesel engine. On several trips since March, I have used Trip 1 and Trip 2 to keep track of average fuel. Trip 1, I reset at each fill up. Trip 2, I reset at the beginning of a trip and check it when we get home after the trip. On an approximately 4000 mile trip out west (up and down the Rockies) we averaged 9.6 MPG. On a recent 2000 mile trip east, I averaged 10 MPG. On individual fillups, I have seen as high as 11.2 and as low as 8.6 MPG. I tend to set the cruise at 65 on the highways. Seems to be in the same range as others that have posted here.
I do essentially the same thing with trip 1 and 2. The last 2 trips which involved some NC, TN, and KY mountains was right around 10mpg. Interestingly enough the Ford computer for fuel mileage was pretty accurate and agreed with my calculations. I only have 4500 mile on the Omni so far and if the Ford is like other diesels I've had, fuel mileage should improve when it's "fully broken-in". I don't expect dramatic changes though. I'm probably around 18,500 GW based on a previous weigh and my current load. Towing the stated Ram 1500 with some tools and supples at around 5500#. Next trip out I'm going to run across the CAT scales again with the toad attached just for my information.
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Old 09-18-2021, 12:52 PM   #35
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Originally Posted by Chance View Post
I recall seeing 350 HP advertised but during a quick look today didn’t see power rating. Maybe I missed it. It would be interesting to check VIN to see if some of the high MPG reports are based on “Economy” tune and or 4.10 gears.


What I would like to see in E-Series is an inline 6 cylinder 5.5L version of V8. That would be more efficient and allow a much narrower doghouse for added leg room.
Not sure that would really work or if anyone would be happy with the results. Perhaps an economy version would be acceptable for a lighter application, but when you throw on an RV body and are running at or close to GVWR it wouldn't be enough. It takes a certain amount of fuel to move a certain amount of mass/weight. If you make the engine small, it may not have the OOMPH to move the mass.

Some people decry the lower HP and TQ in the RV versions of either the gas or diesel RVs vs the "same" engine in the pickup trucks. Remember that the truck manufacturers are engaged in a "power struggle" to have the highest advertised numbers for bragging rights. To obtain those numbers requires a tuning that weakens the overall package and isn't practical or reliable for the long haul. The lower numbers we see in the E/F 350,450,550 in RVs represent that practical side and provide acceptable performance and reliability. If you look at a Ford F350 vs F450, the 350 will have those "bragging rights" numbers and the 450 reliable working numbers.
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