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Old 08-30-2011, 05:44 PM   #1
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Gulfstream 2004, 24 feet with a single slide. Ford 3500 V-10 engine

What grade of fuel gives you the best gas millage?

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Old 09-05-2011, 12:02 PM   #2
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Dollars to miles, I stuck with Regular.
2010 F350 V-10.

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Old 09-06-2011, 08:52 AM   #3
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Thanks, I did just that and over the holiday weekend got 16.6 miles to the gallon. Thats in the hills of Tennessee.
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Old 09-07-2011, 06:54 AM   #4
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My Roadtrek has a Chev. 6.0L engine. The owners manual suggests 87 octane so that's what I use. The engine runs well with that grade and has lots of power in WV and VA mountains.

Your 16.6 mpg in the mountains sounds pretty good. My mileage @ 65 mph is around 16.5 mpg on fairly level highway but drops two or three mpg when I get in the mountains.
Jim D
NW Ohio
2008 Roadtrek 190P
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ford, gulfstream, slide

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