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Old 03-28-2016, 05:55 PM   #1
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Location: Leland, NC
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Improving Gas Mileage

My wife and I did our shake down trip this past Easter weekend in our new 2016 Forester 3011 DS. Even though it rained the entire weekend, we had an enjoyable trip. Driving the RV in bad weather was much easier than I thought it would be, It was also a good opportunity to look for possible leaks. Happy to report there weren't any.
The gas mileage wasn't very good, but I expected that. On this trip we got about 8.3 MPG. I was wondering if anyone with a similar RV, Ford E 450, has installed a K&N high performance air filter and a Programmer? If yes, is there a noticeable improvement in power and gas mileage? Any suggestions on how to improve the gas mileage would also be appreciated. On this trip we were not towing a car, Also, since it was just a weekend trip we were not carrying a lot on board.
Thank you.

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Old 03-28-2016, 06:32 PM   #2
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Improving Gas Mileage

Well, I have good news and bad news.....the good news is 8.3 is a good average mpg for a brand new unit. The bad news is...that's about as good as it's going to get...

We've looked into many options both in this unit and past units. We had a banks system in an older class c that did increase power but nothing really increases fuel economy beyond anything that is statistically significant....

We have the sunseeker twin to your unit...3010ds and we are pleased to average over 8. Sometimes if the conditions are right and we keep the speed at 55 or under we get as much as 9-10 but that is rare. If you can average between 8 and 9, you're doing good!

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Old 03-28-2016, 08:10 PM   #3
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I've got a smaller unit and struggle to get 8 MPH. Look forward to more ideas on better mileage.

Congrats on new unit & Happy Camping

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Old 03-28-2016, 08:23 PM   #4
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Slow down , I get 25% better at 60 MPH as at 70 MPH.
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Old 03-28-2016, 08:24 PM   #5
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I averaged around 9mpg on way home from picking my v10 up. Ford new 6 speed drove solid with great shifting and just gobs of power. Extremely pleased. Drove 600 miles.

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Old 03-28-2016, 08:35 PM   #6
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A tune is not going to improve your mileage. Slowing down is the best way to do that.
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Old 03-28-2016, 08:35 PM   #7
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Yes, sadly, slowing down is the best way. We got stuck in Cal. on a road that was posted at 55 mph for trucks and vehicles towing, vs. 70 for cars. Besides the insanity of having a 15 MPH differential between adjacent lanes (What were they smoking when they thought that one up?), it did kick our MPG from about 8.8 to 10.

Wind drag goes up as the square of speed. It's the law.

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Old 03-28-2016, 09:28 PM   #8
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I have a 2013 SS 3170DS, with E450, @67 mph we got 7.5 mpg, slowing down to 60 got us almost 9 mpg. Plus, I felt much more in control at 60-62 mph.
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Old 03-29-2016, 12:28 AM   #9
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We just returned from a 800 mile trip last week. The wind was horrible and we averaged 6.7 mpg. On the return the wind was still bad but better and we averaged 7.5 mpg. We're happy to get 8.0 and celebrate when we see 8.5. So if you got 8.5 out of the box you're doing good.

I do tend to drive 65 most of the time.
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Old 03-29-2016, 07:28 AM   #10
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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).

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