I think the driver input has more to do with MPG than anything. Some folks may get the best mileage out of the 120race while the next guy may do best with a dd tune. Personally I think the 80dd would give me the best MPG BUT I just can't get the new worn off of the 120race tune. My advise would be to get ahold of Bill & see what he says about your set up & what your trying to achieve, good luck bud
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2000 F-250 SCLB 2wd 7.3 auto PHP stock-65t-80dd-120race-high idle-no start 4"tb exh, wicked wheel, 3 guages, AIS, coolant filt,
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