Quote Originally Posted by thehunterooo
instead of shifting into fourth gear at 20mph, i can stay in 3rd gear, i like it better

yeah, im stuck with an auto, i would have a small turbo in here in a heartbeat if it was a manual though
Your car does not shift into 4th gear at 20 MPH. The shift points occur (approximately) as follows: second at 15, third at 25, fourth at 35, followed by torque converter lockup at about 45 MPH, which feels like a shift but it's actually the torque converter locking up.

So at 20 MPH you are actually still in second and are locking in second gear. You might have more acceleration, but it won't help your fuel economy.