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Let me know if you come up with anything ! I have a 2000 chevy Blazer 4.3, auto tranny, 3.08 rear end and the revs are close mine are just a little lower at 60 and 65 mph. The best I can do is 25 mpg with the tires I have on at this time , with the smaller stock tire I can get 2 mpg more and thats it . Currently I have 198,000 miles on the entire vehicle. Only mod I have is K&n filter . I did not notice ANY difference in mpg.
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