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Old 10-15-2010, 04:37 PM   #29
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1977 27' Overlander
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Well you ask. 27ft Overlander ,7.3 V8 PS crew cab 2 adults 2 dogs full tanks of Propane and Water, and lots of other junk,15 mpg average at max 62 to 65 mph. and lots of traffic lights cause my wife HATES Interstates. When not towing 12 to 14 around town and 20 highway.
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Old 10-15-2010, 05:21 PM   #30
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1963 24' Tradewind
Anderson / Sun City , Indiana / Arizona
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I tow our 24' Trade Wind with a Jeep Grand Cherokee Overland 3.0L Diesel. We averaged 17.2 mpg on our last 14,000 mile coast to coast (and back) trip. I drive 60 mph +/- 5 mph.
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Old 10-15-2010, 06:18 PM   #31
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i was actually thinking of selling it in favor of something with better towing MPG

Just cut the speed to 58.

Mileage in sig

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Old 10-15-2010, 11:00 PM   #32
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1977 31' Excella 500
West Sacramento , California
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2010 Ford F-250 4WD V-10 automatic 4.10 rear end
1977 31' Excella 500

55-60mph over hilly terrain
8.5 mpg avg.

I can climb any mountain...provided there is a gas station on the other side.
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Old 10-15-2010, 11:15 PM   #33
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1968 28' Ambassador
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I like to revise my original post here.

I tow at different speeds but I mostly get about 11 mpg. Thats in the mountains and hills around where we live. I haven't towed on the flat to find out but i'm guessing it would be 12-14 mpg.

We we came down to Zion I towed about 70-75 mph Up and down the mountains. on the flat I hit 80 a few times but mostly drove about 75mph. When we got here I got 9.5 mpg on average. But we did some steep long climbs that I was doing 65+ mph up. so I was only getting about 3.5-5.5 mpg doing that.

Sometimes I sacrifice speed for time. With four kids sometimes going slower is just not worth the wining.
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Old 10-16-2010, 05:18 AM   #34
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On my last long trip of about 3000 miles, with my 1996 F250 PowerStroke 7.3 I averaged 14.7 mpg, hand calculated. This included some mountain, but mostly flat highways. I aim for 60 mph while on the Interstates.

Like the OP, I've recorded in the 17s and 18s, but it had to be under highly favorable conditions, like tail winds.
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Old 10-16-2010, 07:25 AM   #35
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2004 30' Classic Slideout
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We never tow over the trailer tire rating of 65mph unless to pass, especially in hot Summer weather....
12-13mpg with Duramax Diesel towing a 30' Classic with Slide Out....as calculated on the Chevy "Happy Guage" on the D.I.C.
I need to hand calculate this one day.
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