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Old 02-04-2012, 07:37 PM   #11
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Towing my 5,500 pound Surveyor with an F150

55 mph = 11.5 mpg
60 mph = 10.5 mpg
65 mph = 9 mpg

Wind resistance is the key and it is not a linear function but rather is squared (geometric). Square your speed and then compare the squared numbers.

50 X 50 = 2500
60 X 60 = 3600

Difference is 1,100. 1,100/2,500 = .44 or 44% more energy required to tow at 60 versus 50 (due to wind resistance). If you were to tow at 70 (and I wouldn't do it), it is 4,900 or nearly double the wind resistance compared to 50.
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Old 02-04-2012, 07:44 PM   #12
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Don't you just love our 55mph speed limit in California? I keep do it at 55 but my mileage just sucks. Maybe 10.4 - 11.4 mpg. I was expecting a little more since it only me and a light weight trailer.
5.7 liter towing a sail....what do you expect? Trust me, you will not do better except maybe with an ecoboost 150. Hang in there and enjoy the camping.
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Old 02-04-2012, 07:46 PM   #13
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Quote:
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Don't you just love our 55mph speed limit in California? I keep do it at 55 but my mileage just sucks. Maybe 10.4 - 11.4 mpg. I was expecting a little more since it only me and a light weight trailer.
air resistance affects mpg, more than weight. that's why the faster you drive, the more air resistance affects gas mileage.

you're getting excellent mpg for towing a full-height trailer.
unless you have a diesel or are towing a popup, you're on the high end of towing mpg.
you could pull a trailer that weighed another 1000lbs. and you'd probably get close to the same gas mileage.
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Old 02-04-2012, 08:02 PM   #14
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With the Tahoe the best I ever got was 11 mpg @ 60mph, and that is with a K&N air filter and MotorKote in the crankcase along with full syn motor oil. I might have had a tail wind too.
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Old 02-04-2012, 09:33 PM   #15
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I try and stay and 100k to 105k, 62mph to 65mph. The truck seems to like it best at that and I get about 11.5mpg.
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Old 02-04-2012, 11:40 PM   #16
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With the 4.10 gears in our diesel, 50 mph and we get very good fuel mileage, but not very practical. Eventually some idiot would rearend us.
At 70 mph it is just horrible, down around 11 mpg, so we also compromise and try to keep it just over 60. That keeps us out of trouble and do about 13 mpg.
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Old 02-05-2012, 07:55 AM   #17
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I average 60-65 mph and get 8.5 to 9.5 mpg-
our trailer is just over 8100 lbs loaded
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Old 02-05-2012, 08:36 AM   #18
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I try and keep right around 62 mph as much as possible. It is the same as most people who answered here, I find it is the best compromise and well the trailer tires are just not rated to go much beyond that anyway. Even driving through Montana it seems people driving at the 75 mph limit were ok with trailers running at abt 60 and never got nuts, of course you will find crazies everywhere that are impatient if you look hard enough.
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Old 02-05-2012, 08:37 AM   #19
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60-65 mph it means better mpg, less me telling the stupid people how to drive and less driving instructions from the copilot
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Old 02-05-2012, 08:40 AM   #20
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I get 10.3 mpg going 65 mph burning regular. I have used E85, I lose about a few 10ths of a mile per gallon. Sometime for the price difference its worth it. 65mph is plenty fast for me !!


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