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Old 08-29-2021, 08:55 AM   #1
CHS
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New Ford V8 MPG

What are you all getting for fuel mileage with the new ford V8 on a Class C chassis? Tried searching and found nothing specific.

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Old 08-29-2021, 11:00 AM   #2
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8-12 mpg depending on many factors.
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Old 08-29-2021, 12:01 PM   #3
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Originally Posted by CHS View Post
What are you all getting for fuel mileage with the new ford V8 on a Class C chassis? Tried searching and found nothing specific.
Depends on your RV size and weight and what you are towing and also the terrain you are driving in.

If this will help you we have about 4500 miles so far towing a 3000 pound car in a 32 foot Class C at the maximum weight in mostly hilly terrain with an overall average of 8.7 MPG.
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Old 08-29-2021, 12:27 PM   #4
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In our Thor Axis 24.1 based on the new E350 chassis (12,500 lb GVWR) we get 12+ MPG on level interstates at 60-65 mph and 11-1.5 MPG on secondary, hilly roads at 55-60 mph.

Smooth engine, nice handling chassis. From everything I have read about the old chassis, the new V8 based is a real improvement.

David
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Old 08-29-2021, 09:51 PM   #5
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Have Four Winds 32' with toad 8.4 mpg. E-450
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Old 08-29-2021, 10:29 PM   #6
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Originally Posted by DavidEM View Post
In our Thor Axis 24.1 based on the new E350 chassis (12,500 lb GVWR) we get 12+ MPG on level interstates at 60-65 mph and 11-1.5 MPG on secondary, hilly roads at 55-60 mph.

Smooth engine, nice handling chassis. From everything I have read about the old chassis, the new V8 based is a real improvement.

David

Axis/Vegas have same chassis and engine, but highway MPG may not be comparable because they are narrower and more aerodynamic in general than most larger Thor Class Cs.

Your fuel economy is excellent by the way.
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Old 08-29-2021, 11:51 PM   #7
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Axis/Vegas have same chassis and engine, but highway MPG may not be comparable because they are narrower and more aerodynamic in general than most larger Thor Class Cs.

Your fuel economy is excellent by the way.
Yes, the Axis/Vegas is quite aerodynamic. It has roughly the same front end area as a Class C because the nose tapers from the entry door forward about a foot. But it is much, much more aerodynamic as everything is smooth with no abrupt transitions like most Class Cs and has that sweeping windshield.

I was really pleasantly surprised about the gas mileage. I was hoping for 10+ mpg and got 11+ and even 12+ mpg.

FWIW the dash says 12.1 mpg so far with a few hundred miles since the last fill up. Maybe 15 miles on the Mass Pike, but everything else has been on secondary roads. That is probably a bit high as I would expect 11.5 when I next fill it up.

David
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Old 08-30-2021, 10:06 AM   #8
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So with my existing E450 with the V10 I get between 6.5 and 8 mpg, towing a 4600 lb Ford ranger. There is no MPG readout, so all the calculations are done manually.
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Old 08-30-2021, 06:29 PM   #9
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Yes, the Axis/Vegas is quite aerodynamic. It has roughly the same front end area as a Class C because the nose tapers from the entry door forward about a foot. But it is much, much more aerodynamic as everything is smooth with no abrupt transitions like most Class Cs and has that sweeping windshield.

.....cut......

David

The Axis/Vegas twins at 94-inches wide are significantly narrower than larger Thor Cs that are 99-inches wide.

The tapered front you are referring to was described by Thor as 7’-3” wide, or 87 inches. The taper is therefore 7 inches total, or 3-1/2 inches per side. That’s Thor information, not mine. I did a lot of research on Axis 24.1 when looking at buying one.

Since narrower body would represent much less than 1/2 MPG between Axis/Vegas and Class Cs of similar size, it makes it obvious that Axis/Vegas has a much lower coefficient of drag; in addition to +/- 5% lower frontal area.

Newer Axis/Vegas on E-350 may also have 4.10 gears instead of larger Cs on E-450 that have 4.56. If so, that also makes Axis/Vegas more fuel efficient. Just saying that there are more differences than similarities in my opinion.
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Old 08-30-2021, 06:35 PM   #10
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So with my existing E450 with the V10 I get between 6.5 and 8 mpg, towing a 4600 lb Ford ranger. There is no MPG readout, so all the calculations are done manually.
Are you thinking of trading for improved fuel economy? Most RVers drive too few miles to make it worth the cost unless present motorhome is a gas guzzler.



P.S. — Unless buyer downsizes a lot, but that wasn’t your question since asking about large V8.
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Old 08-30-2021, 09:33 PM   #11
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Are you thinking of trading for improved fuel economy? Most RVers drive too few miles to make it worth the cost unless present motorhome is a gas guzzler.



P.S. — Unless buyer downsizes a lot, but that wasn’t your question since asking about large V8.
I am 75 and will be lucky to get 5 to 10 more years driving an RV so we will buy the gasoline and do the trips while we can. Its nice if the price is low but we don't want to be in a hospital bed with a needle in our arm wishing we had took just one more trip. When you get to that hospital bed you will be tankful for all the memories you have so make some.
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Old 08-30-2021, 11:40 PM   #12
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I have a 16 Vegas on e450, buddy has Four Winds 22 on e450. We both tow open car trailers with comparable drag cars.

We travelled to Memphis TN from Florida last year together. Each fuel stop was within tenths either way.

The only advantage Vegas seem to have is high speed stability likely due to 32" longer wheelbase.

We both get 9 to 11 MPG with v-10/6 spd.
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Old 09-05-2021, 11:50 AM   #13
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What are you all getting for fuel mileage with the new ford V8 on a Class C chassis? Tried searching and found nothing specific.
I have the 2021 Thor Axis built on the E350 stripped chassis. Driving around town I am getting 10.1 mpg. On the highway 11.1 without my trailer and 10.6 with my enclosed trailer with a heavy trike motorcycle.
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Old 09-05-2021, 01:51 PM   #14
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WHY ASK!?

There is really nothing you can do to change the mileage you will get.

JUST ENJOY THE EXPERIENCE!
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Old 09-05-2021, 03:25 PM   #15
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WHY ASK!?

There is really nothing you can do to change the mileage you will get.

JUST ENJOY THE EXPERIENCE!
While I agree with the sentiment, there is something one can do: slow down. That is the single biggest thing that will improve mileage for those with that concern.
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Old 09-05-2021, 03:46 PM   #16
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Originally Posted by Chance View Post
Are you thinking of trading for improved fuel economy? Most RVers drive too few miles to make it worth the cost unless present motorhome is a gas guzzler.



P.S. — Unless buyer downsizes a lot, but that wasn’t your question since asking about large V8.
No, it was just curiosity. I get 7-8 on my V10 pulling my Ranger and was curious of the benefit if any with the new engine. Especially since the V10 is a workhorse, tried and true engine. And Ford usually takes a few years to get it right
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Old 09-05-2021, 03:47 PM   #17
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8-9 with my THOR 2021 30.4. V8 7.3L.

Not much i can do the change this. I plan 8 miles to a gal. so... plan. 50 gal every 400 miles... a good hack....
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Old 09-05-2021, 04:31 PM   #18
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From a careful reading of the above posts and posts elsewhere on the subject, the new V8 seems to get as much as 1 mpg better mileage than the old V10.

For example I have never seen any postings that say that an Axis with the V10 will do 12+ mph on a flat interstate at 60-65 mph. Mine will.

Why can mine do that? Well: 1. Higher gearing which means the engine runs slower and therefore doesn't eat up as much parasitic power. 2. Two less cylinders which also minimizes parasitic losses. 3. Timing and valve overlap optimized for the 1,000-2,500 rpm band.

The above won't be as important for a 20,000 lb coach with the lower gearing, so maybe the big gassers won't do quite as well, but I suspect some.

David
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Old 09-05-2021, 05:29 PM   #19
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My axis gets 12+mpg. At those speeds on an interstate.
But
I won't do 10mph under the speed limit to save gas so I seldom sees those speeds on those roads.

I'll consider a bet I can get 13.5mpg at 55mph.

I have, somewhere in this forum, posted a screenshot of my torque app showing 12.5 over a 200mile plus run at an average speed in the high 60's or low 70's.


https://www.thorforums.com/forums/sh...&postcount=254
Is a screen shot if me getting 7.1mpg at 70mph average over 180miles and a steady SIX THOUSAND ONE HUNDRED FIFTY FEET CLIMB. Lake Havasu City AZ to Williams AZ.
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Old 09-05-2021, 06:03 PM   #20
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Yes, we are lightly loaded and try not to fill tanks all of the time. I have experimented with faster speeds, slower speeds. My engine only has 6K miles on it.

I run typically 63 MPH at a 2100 - 2300 RPM range, in 6th gear on I-95 for example. I don't do rapid takeoffs, and occasional passing. This is the sweet spot for this RV. Smooth running, low air noise. comfortable ride. The truckers hate me... but i aint speeding up to 70+ mph to please them....that is another topic....

The FORD F-53 fuel mileage and MPG readout are pretty accurate. Sometimes i see 8.9 mpg but typically in the low 8's.

Remember, this is for planning purposes only. The object is to not return home with very few gals of fuel left in the tank or ever run out of fuel. so with an 80 gal tank, each line tells me 20 gals.

I try to stretch it alittle and gas up at home with my Parkers card at $2.69 a gal.
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