Join Date: Oct 2011
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think i was at 21mpg hwy maybe more its been some time now. my truck is on 305/55/20's with 3.73,so my rpm's are lower then stock. you can go bigger and detune it so it's reliable.
2001 F-250 4x4 5.9 12v ppump built trans many more mods 500+hp
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2006 F-350 4x4 ficm by ficmrepair with php hercules tune,arp studs,BulletProof EGR, sct with custom tunes