Had a 348 in a 58 impala. Ran good and nice car but used a LOT of gas. Traded it for a 58 wagon with a 283. Bigger,heavier car with a smaller engine but used less gas. Cant figure that one out.
Weeds
My uncle had a 59 impala 6 cylinder.
When he bought a new Impala in 64 or 66 his son was wanting him to get a v8. My uncle said no I do not need a gas guzzler.
My dad said get the v8 but not the one your son wants, get the 283 you will get better mpg then a 6.
Well my uncle went for the 283 and was surprised he was getting better gas mileage then his old 6.
My 67 Impala with a power glide would get 22 highway. Once I got 25 mpg doing 55 mph on a long road trip.
15 local, 18 mix local and hwy.