LOL... driving around here on I-16 and I-95 will get you run over if you aren't doing at least 70!
My EVIC is showing me at 21.5 mpg still my last fillup... I've been driving 65-70 to and from work on I-16 (30 mile round trip) just to see the difference and yeah, it's a little better than driving 80.
Doesn't really matter to me though, didn't buy the PT for gas mileage. I bought it for it's coolness!
Still debating on going home to NY in Aug/Sept... I usually fly to the tune of $200 roundtrip. Have driven it once back in '98, took 19 hours.