Cummins 6BT MPG:
1 dont grind on the fuel pin or plate.
2 aero, like narrow tires and lowering, fold mirrors in, Moon discs on wheels
3 overdrive with 3.54 axle, or better yet swap a 3.21 rear
4 replace stock turbo with something more efficient, as in more charge at lower egts at cruise
5 more efficient intercooler
6 Banks intake elbow casting
7 dont do huge exhaust, just a better flowing muffler
30 mpg is probable.
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