Join Date: Nov 2006
Location: Moses Lake, WA
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is your speedo correct. If your like me w/ my 37's I'm 16% off. That can add up to 2 mpg. For example if your getting 13 mpg x 20 gal fuel=260 miles.
260 miles x 16%=301.6 miles 301.6 miles divided by 20 gallons = 15 mpg. Hope thats not too confusing. I thought I lost a crap load to when I put on my 37's but then I checked how far my speedo was off and calculted back. It made feel a lot better. I even had ford try to recalibrate my speedo, no go still off. Best thing to do is see if somebody has a GPS and check your speedo to that.
99.5 F-250 PSD AT 4x4, 4in lift, 37 13.5 18 Pro comp Extreme A/T's, S&B Intake, GTP38R, DP Tuner custom programs (140 Agg., 120 sled pull, 80 tow and 60 tow), Rosewood DIY stage 2 injectors, BTS Trans, 5in exhaust no muffler, 6 oh intercooler, Ford AIC, EBPV delete, Foil delete, T/C lock up mod, Pusher Fuel Pump, Three Chime train Horns
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