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no not true...............stock my 2.4 got the same gas mileage but with beeter intake and exhaust it got better and it just improved with the performnce stuff. i think the cams and head might have dropped it a little but not much.
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72 442 "THE BEAST", 99 Alero - OSV Replica w/ original OSV parts, HURST Dual/Gate Shifter
Beware of the BackStabber
 
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