Re: 292 questions
A 250 will definitely get better mileage than a 292. 292's are well known as gas hogs.
With your gearing and tires, I wouldn't be suprised if you got 8 mpg or so.
I've played with mine a lot, converting to HEI, and installing 3.08 gearing, and I can get 14 mpg most days. This is a 2wd truck with 28 inch tall tires though.
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