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Old 01-09-2013, 07:43 PM
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A good point was made on oil type which does actually make quite a bit of rolling resistance difference on synthetic from mineral based oil. On my last 71 Gm 4x4 I switched tranny (manual) transfer case and both diffs to synthetic iol and picked up 3mpg and that was in the winter months, shifted way better and rolled so easily, was actually surprised that it helped that much, the claims are true. also things like an advance curve kit for the distrib helps a bit and a rooler valve train, even rooler rockers alone help. It all ads up after a while. As you previously mentioned the optimal gear ratio also helps too.
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