Well, a friend of mine said they put it on a School Bus and went from 4mpg to 13mpg. I have a call in to inquire about more info for the diesels
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2006 3500 Mega Cab, S&B intake, Tripple guage cluster, Line X, Skyjacker 2.5 lift, 5100 shocks, Aero Turbine 5" turbo back, bully dog , 305 Mckys on 20" moto metal's, EMS off road Free Spin Kit, Mag Hytec Diff cover, Amsoil Sythetic , Bushwacker fender flares, Custom mud flaps,
92 4X4 cummins 4" lift, 47rh trans, custom flip shacles in the rear, ,