I have to agree that the mileage your getting is pretty good. Heck my 95 Yukon only gets about 13 mpg and my 69 when I checked when it had the 307 was getting 9 to 10 mpg. Realistically, unless someone comes up with some cheap suggestions, you are going to be money ahead leaving it as it is.
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1970 Blazer with a 400 sbc and 4" lift
1980 Pontiac Trans Am, 455 Oldsmobile
2012 Kawasaki Concours 14
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