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I've been through two tanks of fuel since I installed a BHAF (Napa #2790), and both MPGs have dropped. I know MPGs can fluctuate from driving habits, weather conditions, etc. But driving has been pretty much the same, maybe some windy driving conditions during the first tank, but I expected to see at least a moderate increase...





- djb
 

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you prob didnt even need to go bhaf since you have no mods and prob had the right air/fuel ratio before. IF you want your mpg to go up get a chip, mine whent up from a constant 16mpg to 20mpg with edge. just my o2, your talking about a fraction of a miler per gallon i dont even see how you calculated that out that far.
 

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i dont know even when my truck just had a stright pipe with the BHAF i got like 1-2 mpgs better then i went to the chip and now im gettin 19 mpgs and thats with my foot in it most the time
 
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