Quote:
Originally Posted by chris719
Plus, if the ECU retarded timing to compensate, his fuel economy probably took a slight hit, too. I don't know if it would make up the cost difference, but it would be amusing if it ended up costing the same overall.
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probably not.
did a quick calc based on info for my work truck since i drive that a lot and know pretty well what i get mpg for regular and premium, and with the current gas prices in my area ($3.50 for regular, $4.20 for premium), I have to get 3 mpg better than regular for it to break even on a cost per mile basis.
For reference, my truck gets ~17.5 mpg on 87 and ~18-18.5 mpg on 91.