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Update: watched a 12 valve go from 28 mpg to 19 mpg in 6 months and I think I know why
Picked up a 96 Ram with the 12 valve back in March and it was getting 28 mpg on the highway, hand calculated at every fill up. By September the same truck on the same route was down to 19 mpg and nothing obvious was wrong, no smoke, no codes, ran fine. Turned out the fuel screw had been bumped by a shop that did some pump work and they hid it behind a fresh paint mark, plus the timing was retarded a few degrees. My side of the debate is that guys chasing power always say the mileage loss is the price of the game, but the other side is that a stock pump should never lose 9 mpg from a simple tune up. Curious what you guys think, is losing a third of your fuel economy ever worth it, or was this shop just covering for a bad pump?
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beth_hart6814d ago
Agreed, always figured the mpg hit was just part of it, but 9 mpg off a tune up is nuts.
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