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Old 12-01-2015, 07:19 PM   #11
Join Date: Jan 2015
Location: Beaumont, TX
Posts: 83
Please see my post here regarding mileage

Fuel Stats

2014 SunSeeker 3170DS
Ford F-450
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Old 12-01-2015, 07:52 PM   #12
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Location: Ontario
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A friend of mine travelled from Illinois to Alaska this summer and was amazed by his fuel mileage in Canada where they only sell ethanol free fuel.

Sorry we don't only sell ethanol free fuel , we have the crap in our fuel also!!!

2014 Forester 3051s
2016 Nissan Pathfinder SL
2012 Sonic toad
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Old 12-02-2015, 01:50 PM   #13
Join Date: Apr 2014
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I have a 2013 3170ds. I alway have my SxS and a few quads with me on a 24' trailer. My average is 6.9 MPG. Remember if you run the generator it uses the same tank. I know not much but in the summer going on long trips we run the gen and AC the entire time.
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Old 12-02-2015, 04:55 PM   #14
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Join Date: Dec 2007
Location: Pacific Northwest
Posts: 788
I've been averaging 8 mph in my 3170. I have the computer desk, I travel alone. I haven't found the "Sweet spot." I have had a couple occasions when I got 17, 16, and 12 mph. Those were anomolies.

Generally a tail wind, or downhill on a freeway will get you better than 8 mph.
JJ only, my cat went to Rainbow Bridge July 2015

I love my Sunseeker, when I'm on a trip I don't wanna go home!!!"

Total days camping each year: AS MUCH AS POSSIBLE!
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Old 12-02-2015, 06:58 PM   #15
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Originally Posted by LTRVing View Post
Just came back from our maiden voyage in our 2013 3170DS, averaged about 8 MPG, 3 adults, 1 child, no tow or water on board, minimal supplies for three day RV ring out. Usually traveled 60-65 MPH, rarely faster, felt comfortable about 62-63 MPH. Tried to get into higher gears quickly, cruise control used when possible.

This is a Ford F-450 V10, with about 18,000 miles, is there a speed sweet spot for the best MPG? Should I expect better then 8 MPG?

Thanks for the help and insight.
Nope -- unless you're going downhill with the wind at your back all day.
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Old 12-02-2015, 09:01 PM   #16
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Our optimal speed is 62, if any higher, the vibration is awful. 2007 Sunseeker 2860 w Ford 450 v10 gets 10 mph w no toad or water
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Old 12-03-2015, 07:09 PM   #17
2014 Sunseeker 2650S
Join Date: Oct 2012
Location: Rome, NY
Posts: 116
We have an early 2014 2650S (2013 Ford chassis) and have learned there is no consistent “sweet spot”. We tow a 5,000 combined trailer/race-car. In 2013, we traveled 3 different 1,000+ mile trips and averaged 8 MPG. Cruise control was set at 55-60 MPH.

For 2014, based on other posts, we invested in a ScanGuage E. We made 7 trips that year. The very first trip, we continued with the cruise control set at 55-60 MPH. The main objective of this first trip was observing instantaneous MPG under various conditions. There were a couple of surprises. Going uphill, the MPG could drop down to 3 MPG. Going downhill, the MPG could be 9999 MPG, but the transmission would automatically down shift and keep us from going 4-5 MPH over the cruise control set point. This cost/lost us kinetic energy. And going level on a seemingly flat road (currently looking for a clinometer), we’d see 11-13 MPG (hard to see up/down hills of 1-2 degrees).

For the second trip, we used the cruise control only on level ground, again at 55-60 MPH depending upon traffic conditions. However, going uphill, I’d press the cruise control button off and slowly let the MPH drop, trying to keep the MPG above 6 MPG. Of course, how much we’d slowdown was dependent upon the length of the hill. But going up a long hill slower still achieved more MPG than trying to fight both wind resistance and gravity. And going downhill, we’d again break the cruise and let the MPH jump to 70 MPH (seems to be an aerodynamic limitation with sub-7/8 grade downhills) with the MPG at 9999. We achieved anywhere between 8.5-8.75 MPG on the remaining trips.

From what we observed, on flat land the cruise control is ok. But going uphill, the cruise control trying to maintain speed was very, very costly. And going downhill, the automatic downshift to keep from speeding was somewhat costly.
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Old 12-10-2015, 12:42 PM   #18
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Join Date: Aug 2015
Location: Montreal
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Originally Posted by 6inthefamily View Post

A friend of mine travelled from Illinois to Alaska this summer and was amazed by his fuel mileage in Canada where they only sell ethanol free fuel.

Sorry we don't only sell ethanol free fuel , we have the crap in our fuel also!!!

We also have bigger gallons in Canada. Actually 4.55 litres. Our 2009 E450 Ford V10 has shown between 12-14 mpg. On most of the 4 lane we use the limit is 62 (100 km/hr) so I run at just below 60, also accelerate slowly, letting the engine pick up speed, rather than pushing it to speed up. We also prefer to see the sights so we're on 2 lane a lot, limit is usually 55 mph. Two evils for good mileage are speed and a heavy foot.

Sun seeker 2009 2600 Ford V10

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