Join Date: Nov 2011
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I do what Airstreamer does but with a 13K 37-foot 5th wheel (see the pic in my sig). On our last long trip (4,000 mile round trip from Florida to our B&B in New Brunswick, Canada to Toronto and back, including some side trips) we averaged 10-12mpg doing 65-70mph.
I'll start up a hill then turn off OD when it drops out anyway, then turn it on again once the speed comes back up to cruise.
Certainly on flat or downhill terrain, OD works just fine and helps fuel economy.
2003 Ford F-350 XLT Extended Cab, Dually, 7.3L 2WD
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