Quote:
Originally Posted by Pyrotechnic
Honestly, a 5.3L and 4L60E would be your best bet for mileage and it fits the description of what you want. With the lighter weight of the older trucks, you should be able to get at least what new trucks get if not a little better.
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I put a stock 5.3l in my last project "Silver dollar" and it got 15 around town and 18 on the highway. pretty much what a stock 99-0? gets. Ill let you guys decide if thats good or not