when im sitting on empty and the light is on telling me i need gas, the absolute most i have ever put in is a tad over 13 gallons, and i have a 17 gallon tank.
It'* because the gas tank is oddly shaped. It'* an "L" with the vertical part of the "L" the thickest part.
As to gas mileage, my car has consistently gotten 20 MPG from the day it rolled from the factory, and it doesn't much matter what kind of driving-freeway at 80, around town, never varies much.
I did make a 200-mile drive recently and made it a point to use the cruise control, which I normally don't, and it got almost 22.
I was amazed. I've thought about changing the 02 sensor, as many here recommend, especially at 124K, but since the mileage has never varied....why?