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Old 03-29-2016, 12:01 PM   #11
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I have had 2 Class Cs, both with the V-10. The best mileage I ever recorded was about 10.5 to almost 11 mpg, but I was on a 2 lane road going about 50. My new 3051 I am getting about 8.5 going 65. The only way that I know to increase mpg is just to keep it about 60, but that is hard to do on the Interstates.
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Old 03-29-2016, 04:50 PM   #12
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Dragging a parachute. Thats how I've heard the drag from the square tail on a RV described. Same article said the extra weight of a reasonably sized Toad is offset by the reduced drag because the Toad breaks the parachute. Dunno if it's true.
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Old 03-29-2016, 05:00 PM   #13
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I tow a open car trailer/with Falcon every where and depending on speed, weather, traffic and terrain will average between 7.5 and 9.5. Cold air intake and Banks controller for trans shifting.
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Old 05-16-2018, 11:43 AM   #14
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Best I ever got was 9.2 mpg unloaded and averaging 65 mph on the way up to Indiana for some warranty work. Loaded I get mid 8s fairly regularly averaging between 60 and 65 mph and with a toad out back I will see anywhere between 7.6 and 8.2 at the same speeds. My old C was almost 10 feet shorter and more than a ton lighter than my 3011 with the same engine and transmission. It got very similar mileage numbers at the same speeds. You're driving a box and all that wind pushing against it is going to be the main drag on your mpg (pun intended).
We just drove 800 miles in our 2500TS and got 8.3. Speeds between 55-65. Some crosswind. 30 gals of water. Up and some hills. I found it better to drive at night, less wind, less drivers that don't know how to accelerate the on ramps. Less air conditioning demand. I wondered if rear farings like trailer tails would reduce drag. As it is we are hit on both ends, front pushing air aside and the rear being sucked rearward by the vacuum created. Can't help the front. The rear, maybe.
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Old 05-17-2018, 09:38 PM   #15
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GigSeeker, I remember reading somewhere that the toad breaks up the suction effect.
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Old 10-01-2018, 12:22 AM   #16
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I too have the new f53 with v-10, towing a 2dr Jeep Wrangler. Got fuel after burning 1/2 tank cruising at 65mph (2500rpm) and did the math. My jaw hit the floor and I checked the math... 6mpg! This last trip was same configuration, less wind, kept speed at 60 or less and got 7mpg. I don’t expect to ever see 10mpg..unless no toad and I cruise at 45mph. Lol.
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Old 10-01-2018, 07:55 AM   #17
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I too have the new f53 with v-10, towing a 2dr Jeep Wrangler. Got fuel after burning 1/2 tank cruising at 65mph (2500rpm) and did the math. My jaw hit the floor and I checked the math... 6mpg! This last trip was same configuration, less wind, kept speed at 60 or less and got 7mpg. I don’t expect to ever see 10mpg..unless no toad and I cruise at 45mph. Lol.
Not “too”. Foresters are E-450’s, Mercedes Benz Sprinters or Ford Transits.
No big box F-53’s. I get a touch over 9 average with a well balanced GTS towing a Fortwo at about 60 mph on 87 octane. I use a 5 Star Custom tune.
My big box with the 5 Star towing the same car at the same speed got an average of 7.5.

For the OP: A trailer tail might help if you have no rear slide. Vortex generators that stick on the edge have been shown to be ineffective. Reducing weight and mass will have an effect but I’ve been told that leaving my spouse home will not work.
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Old 10-01-2018, 08:28 AM   #18
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Want to save fuel? Slow down.

Once rolling air resistance is the primary consumer of power and air resistance increases exponentially with speed. Fuel use is directly related to power needed. The air resistance of any object at 70 mph is twice what it was at 50 mph.

Air resistance can be reduced by engineering, the Prius being a prime example, but pushing our aerodynamic bricks thru the air is very inefficient.

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Old 10-01-2018, 09:25 AM   #19
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Chevy 6.0 with a 6 spd. 60-65 mph averages.
I got 11 on my last 3200 mile trip with 500 lbs on the rear (no toad).
I have a GVW of about 11,500 loaded.
With my 4000 lb toad I get about 9.5.


2 less cylinders than the V10 and shifting manually.
I probably would not want the 6.0 with any larger box though.
Works perfect as is.


Key here as everyone stated...slow down. 60-65 is much more comfortable and easier on the wallet.
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Old 10-01-2018, 10:04 AM   #20
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Speed does not always save time if there is any distance involved.

When my daughter (and my money) went to Gettysburg College my drive at "plus 10" from Cleveland across the mountains on the turnpikes required a fuel stop with my Expedition. At the speed limit I could get there with no fuel stop. Times were identical. The delay caused by getting off the road and refueling negated the benefit of the faster speed. And burning less fuel saved (probably) enough money to buy a beer when I got there.

Towing the camper, of course, burns a lot more fuel.

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