Buddy has a 99 f250. Php 6 pos, garret 38r, addrenaline hpop, intake an exhaust.and fass fuel system. He says he keeps loosing fuel mileage. Changed all fuel filters, buzz testedinjectors, cylinder contribution test an every thing checks out fine

 

What was his mileage before and what is it now?

 

Is he losing fuel mileage or is his foot getting heavier?

 

He said about 17-18 droped to 13-14

 

Winter Fuel maybe

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