no I was assuming that the 66 was a C-4, with a carbed 302 or 289 with a C-4 and 4.11s will not get good gas mileage regardless on the highway, due to the revs.
It might be a little better with a 5 speed or an aod, but it wont be much better with a carbed motor, you'll be looking at 11 -14 mpg at best with an overdrive, and thats if u dont ever get into it, otherwise your gonna be at 5-8. I have never cared about gas mileage on performance cars like these, with carbs it should be somewhat expected that your mileage will be less anyway. Is the motor built up in this 66?
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