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Search: Posts Made By: Brigadoon
Forum: Running Gear, Axles, Brakes, Wheels and Tires 05-06-2008, 05:30 PM
Replies: 18
Views: 4,312
Posted By Brigadoon
It is probably that effective gear ratio change,...

It is probably that effective gear ratio change, caused by the larger diameter tire, that increased my miles per gallon.

The coach came equipped with 275/70's, and 4.88 gears. This had my Cummins...
Forum: Running Gear, Axles, Brakes, Wheels and Tires 05-04-2008, 02:42 PM
Replies: 18
Views: 4,312
Posted By Brigadoon
I did change my tire size from the 275/70's to...

I did change my tire size from the 275/70's to the 275/80's and had an engine rpm drop of 100 rpms at 62 miles per hour. In my case that was close to a half mile per gallon gain in mileage.
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