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Originally Posted by joselu43
But I think that the big picture is that in some cases it may be a good idea to explore changing the gear ratio to improve mileage. In my view, the percentage will depend on the particulars. You may lose or gain.
JL
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Exactly right.
There is no disagreement that a reduction in engine speed will improve the fuel economy of a vehicle with a diesel engine. You definitely will not lose.
The issue is whether or not your percentage gain exactly matches your axle ratio change. This was his original premise.