You're lucky to get even 31.9MPG at 75. My car averages around 28.9 on the highway. And around the city...don't even.
Around the city my car does terribly. Now... I didn't buy the car because of MPG, so i'm not going to complain too much. Just trying to give another MPG example for you guys.
Wish I could get 33 though. I'd be more than satisfied with a number like that, even if I had to go a little slower than my average 75.