Curtludwig,
I don't think going 60 is going to help anything out, these cars have a narrow efficiency range, so 3000RPM @ 60MPH = bad mileage. Maybe on the manual though, I don't know. And I meant average speed, like min + max divided by two. You don't want to be doing 30 through the S turns around here. I do think the thermostat could be stuck open I'll check this later, it does warm up slowly.
TMAllison,
I like the GPS idea. Although, I don't have one

. I was thinking about rigging up my bicycle odometer to one of the back tires, It's like the one in this link:
http://www.uxcell.com/functions-bicycle-bike-lcd-led-meters-speedomter-odometer-p-4741.html I can calibrate it to the size of my tires and get very accurate data

. Will post pictures for you.
I drive it every day to and from school, but it's only a 3 mile drive and it can't suck up that much gas being cold going to school, can it?