whats your average gas mileage?

im planning a road trip in my newest beater soon.
it occurred to me you fellas would have a realistic idea of gas mileage of a typical c body with a low comp 440.
typical car,around 3800 lbs low comp 440 auto with around 2:94 gear ratio.
ill be running the thermoquad,so hopefully? some form of 10-12ish isnt too much to wish for?
Author: BeatersRus