My last fill-up was after 478 miles, and I used 13.5 gallons. Assuming that I had 1.0 gallon still in the tank, I could have theoretically driven 513 miles.
95 Contour Zetec, ATX (wrecked, sitting in the barn)
95 Mystique Zetec, MTX
2000 Taurus SEL 3.0L Duratec
1994 Crown Victoria LX 4.6 V8
1993 Chevy Silverado 4.3 V6