Contemplating a 12 Valve swap. What kind of highway MPG's (70mph) can I expect from a 12 Valve in a 2000 F250 4x4 Crew Cab 8' Bed with 3.55 gears and an NV4500? This would be my ideal application, using the stock tire size and stock engine besides maybe a straight pipe turbo back 4" exhaust and BHAF. Any input would be greatly appreciated.
I am consistently getting 19-20 at 75mph. 4.10 with 35x12.50 tires. I have a 12v with he351 stock injectors, dv's, 3.5" exhaust and a finely tuned afc. Before I got the afc spot on I was getting around 17.
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