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Old 05-14-2014, 06:21 AM   #16
Tx Firefighter
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Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
Re: rear end swap for different gear ratio

Quote:
Originally Posted by scrapmetalart View Post
what kind of gas mileage do you experience?
Average 12-13 MPG. I've built trucks with 3.73 and 700r4 overdrives and never got over 14 with a very mild small block. Hence the reason I just save my money and use turbo 350s and those old 3.08 rearends that no one wants. I think without going to EFI, around 14 is about all one of these old bricks is gonna get.
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