[Jake L]

I want to know how much money Sam and Dean Winchester are spending on gas!

 

[Monkey Wrench]

depends on the motor
a stock carbuerated 305 would still gobble gas just cause its older and bigger is just worse

 

[Don E]

10 to12 mpg.

 

[Gregg-O]

A '67 with a 327 and a quadrajet that was all working well could get 17+ on the hiway at 75mph...IF you keep your foot out of it.