I just filled up my tank tonight. I got 554.6 miles out of this tank. 500+ miles per tank is almost common now. I also got my second best of all time mpg at 39.89!
Also of significance I got my biggest fillup at 13.9 gallons. The fuel pump sounded funny when I pulled into the station, so I think it was sucking air. I always wanted to know how far I could push it since I'd like to try for a 600 mile tank. To do that I'd have to push FE up over 43 mpg. Now I know what it takes. I think I can, I think I can!