well, I bought gas last night, and figured out my mileage... I'm getting just over 14 MPG!!! I commute about 10 miles a day... more than half is freeway... I just changed my fuel filter, cap/rotor, and did general tune up stuff... I could probably stand to change my oil again... been just about 2200 miles... I shift when my manual tells me to... at 12mph, 24, 35, 45 (works out to about 1950RPM) but I've tried shifting at 2200, and 2500 as well on previous tanks... -should I cave and buy one of those "add 15% HP and increase gas mileage little gimmicks?