i know that when i put a chip in my s10 that it required that i use premium unleaded. with a price difference of approx. $ .20/gallon, it goes a long way towards offsetting any savings realized by increased fuel economy. the mileage increase i got from my chip was more than offset by having to pay for much more expensive gas...at least now 20 cents is only 10% of the total gas cost instead of 14% when gas was 1.50. gas now 2.40 and still climbing!!
redrum
03 gt
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