Poor fuel mileage
I have an original 64 impala base model with a stock 327 all original. Rochester 4GC carb.
I’m getting 9-10 mpg. I’ve been told that’s about the best I’ll get because it’s just old. It runs, drives, and starts cold just fine. No smoke. Idles nicely. Seems normal and smooth. Drives nice and normal as well. Doesn’t have any punch but it’s just stock. Should I be getting better mpg? What can cause low fuel mileage? And were should I start?
Thanks for any advice.