My first tank was like 23mpg, I've since gotten to the point where I average ~30 and I'm usually 70-80% city driving.
Sadly though even with 90% highway the highest I've ever gotten hand-calculated was just over 34mpg :(
Though, highway/freeway speeds in FL are 70mph speed limit and that certainly is at the point where mpg starts to go down.
2012 SGM SEL Sedan 303a w/o Nav | Job 1 built 6/2011
FSWERKS Cool-Flo w/ ITG Filter | FSWERKS Stealth Exhaust | 17x7.5 Axis Sport XMX Graphite wheels
Sonic Crew #28 | Rally Revolution #117