Diff Ratio Dilema

Do you want good gas mileage or great mileage? I first had 2:73 and got 27mpg then I had 3:23 had 24 now I have 3:73 and run like a bat outa hell and love it. and don't even care what my mpg is. It basically depends on what you wanna do with it I know I wasn't any help sorry.