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Old 01-11-2015, 02:30 PM   #3
bushpilot
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Join Date: Jul 2011
Location: Tomball
Posts: 1,414
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Im with Bob !

At 72mph I'm turning about 1650 rpm and it puts my MPG in at a consistent 9.9
when I've had to travel in the 1200/1300 rpm range my mpg was slightly over 13 (towing our wrangler too).

I cant remember what my door tag stated as to the rear gearing on our coach but i know its lower than a 4.10 (its a 3.xx something) and id prefer to have an even lower gear set - we don't run the coach around town - we run it on the highway for great distances 100s of miles at a time.

Our coach is programed to start out in 3rd gear - and if i could i'd re program it (myself) to start in 5th or 6th.

If i need to move slow or leverage low rpm torque ill shift it manually, til i get to 3rd or 4th gear, then let the computer take over and provide some skip shifting !
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Don R.
'04 Haulmark (M42386) 42', 2 slide, 10kw - Pictures
'04 F350 CrewCab Longbed 4x4, 50g aux tank & gear vendors dbl over
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