How many miles do you get with a full tank?

Just wanted to see how the mileage varied among drivers and cars

1) Year
2) Motor (Auto/Manual)
3) How many miles you get with a full tank
4) Any mods to the car that would affect the gas mileage (for better/for worse)
5) Have you done anything to improve gas mileage?
6) Have you fixed any issues that were causing bad gas mileage and noticed it went up after fixing?

Thank you very much for your time and input :)