I've driven several muscle cars as daily drivers - it's just been a long time since I did so.
I've had small block late 60's Mustangs and got 18 mpg average which I consider pretty good for a late 60's/early 70's car. On the other hand my '70 Olds 442 big block never broke 12 mpg no matter how hard I tried. There was pretty much nothing from those days that would crack 20 mpg and still have horsepower.
Your 30 mile commute will probably be okay as these cars do a lot better on the highway at a constant speed. Your 120 miles delivering pizza is gonna kill you though.
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