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My Dad had a 1981 blaser with 305 engine, manual trans. he got 27MPG (Canadian) highway.
I had a 1979 monza spyder 305, manual trans, very low gearing, I got 24mpg, I switched to a 350 and couldn't get 18mpg. I have had 1978, 1988, 1993 GMC trucks with 350's average about 18-19mpg. I have a 1981 corvette with a 350 and 4 speed auto, 28mpg highway, one time I got 31 but I was cruzing about 40mph.
My brother had a 4.3V6 in a S15 truck he was not happy with the millage, he didn't say what it was.
If I were going to choose, instead of just buying whatever I could get. I would get the 305, unless I could afford the LS-series model. The 305 gets the best mileage of the 3 engines, has more power than the 4.3V6, alot less than the 350. Might look into 3.4V6, have heard good things.
Diesel fuel cost more than gas here and they are expensive to buy, more to maintain, not cost effective. chev V8 cheap to buy, cheap to fix, easy to fix, and reliable.
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