Re: gas milage

Posted by JeromeSolberg On 2022/3/14 19:01:48

In my experience, I think the 327 with the 4bbl carb and the Ultramatic, on a Cavalier or Patrician, isn't going to do better than 15 mpg, and city traffic or sustained highway driving at 65 (or more) is worse, down probably to the 10 mpg level,due to the Ultramatic (in town) and the 3.54 ratio without overdrive, which makes the engine spin pretty fast at highway speeds.

Interestingly enough, it seems like before I rebuilt the engine, when performance was noticeably poorer, I got better fuel mileage. I think that is because I am heavier into the pedal - driving style contributes a lot.