Thread: 88-90 454 gas mileage
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Old 02-09-2010, 03:39 PM   #12
70duramax
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Join Date: Dec 2008
Location: morrisdale pa
Posts: 46
Re: 88-90 454 gas mileage
in order to get decent milage out of a 454 you need to bump the compression up to 10:1 and get a good set of headers and you'll see 13-15mpg all day
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