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Re: 305 v8 or 250 I6 for better mpg
I used to own a 68 with a 250 and a SM465 with 3:73 rear. That sucker only got about 10 mpg. I think your best bed for increased fuel mileage is to go with a 3:08 rear end gear. It won't be as good from the line but it might help at cruising speeds. Better yet would be to get an overdrive transmission.
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1978 Chevrolet Silverado 3/4 ton 400 small block.
2000 F-250 Powerstroke
2002 GMC Yukon Denali XL
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