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Old 11-02-2011, 05:45 PM   #20
ol_skool_chevy
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Join Date: May 2010
Location: Hillsboro, Oregon 97123
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Re: 250 i6 fuel economy w/o sacrificing HP

Quote:
Originally Posted by geezer#99 View Post
You're looking on the wrong end. Your mpg is suffering cause of the O/D and 3.07 gear.
You'd get better mpg with more gear like 3.73 or 4.10. Less throttle opening equals more mpg.
However nothing wrong with some hop-ups. Headers and a 4 bbl intake with small 390 holley will help.
With your gearing a 350 would probably get better mpg though.
Sorry but I have to agree with geezer#99.
your Much better running the 3.72 gear with that t-5
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