MPG - Page 2 - Fiberglass RV

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Old 08-27-2009, 10:47 PM   #15
Gina D.'s Avatar
Name: Gina D.
Trailer: '77 Leocraft 17 & Former Burro owner and fan!
West Coast USA
Posts: 9,016
I just did a 650 mile trip across I-40 in AZ/NM and then up the 25 to Colorado Springs. Its mostly flat, and I already started at elevation.

I decided since it was relatively straight and an easy tug, that I would set the cruise to 65 instead of my usual 60. UGH!!! I was lucky to get 13 mpg that way. At 60, I get 15-19.

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Old 08-27-2009, 11:21 PM   #16
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Trailer: Bigfoot 2500 Series (25C9.6E 'Yeti')
Posts: 101
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I dislike interstate roads, and love scenery.

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Old 08-28-2009, 08:13 AM   #17
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Name: Roger
Trailer: Y2K6 Born Free 32RQ on the Kodiak chassis, 1995 Coachmen 19' B-van and 1996 Precision 21' Sailboat
Posts: 5,000
Frontal area and speed are the two great determinants of fuel consumption, all other things being equal. Selecting the "right" tow vehicle is important (engine/trans/rear-end ratio), but more important is what the tow vehicle is used for every day. If you have several children, for example, a van or large SUV may have to do double-duty. If you tow frequently, safety and comfort may trump gas mileage in importance. I could easily get 15-16 mpg towing my Scamp 16 using my Y2K Excursion with the V10. It got pretty much 15-16mpg on the highway most of the time whether or not I was towing. Towing either my 17' Bigfoot or my 25' Bigfoot with a much larger frontal area, that dropped to about 13mpg. That's also about what I get towing my 25' Bigfoot with my '07 Titan 5.6l V8.

Gas mileage varies a little while towing... but in most vehicles with a tow package, it won't vary much.

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Old 08-28-2009, 09:06 AM   #18
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Name: Wilder
Trailer: 1993 Scamp 13 ft
Posts: 61
Drag coefficient and acceleration have by far the greatest affect on gas mileage. Engine size doesn't really make much difference - it's the larger drag coefficient of larger vehicles that hurts your mileage, not the fact that the cylinders are larger. Of course the amount of weight you carry is directly related to the mileage you get (each gallon of water you carry weighs 8 pounds). Also, the further down you press that gas pedal, the more fuel you are using, so think of the pedal as a gauge - keep it light and accelerate slowly and your mileage will improve. Something that should help trailer towing (I don't know how much) is that vehicle length has a big effect - the longer the vehicle, the lower the drag coefficient (the reason those Salt Flat racers are much longer than they need to be and also why trains get such good gas mileage).

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