Well, considering everything technically OK, sweet spot for 3406E is 1400 RPM, so try to keep it between 13-1400. Use a progressive shifting, shift fast drive slow. Can't promisse much, but i did get 6.8 lifetime average (at the pump, ECM showed 7.3) from my 1995 3406E.
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Pessimist,- is just well informed optimist!
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