2007 2.5L Automatic I think my gas mileage is becoming worse? I drive to school and back every day which about 4 miles away, and to work and back 3 days a week and it is only 14.5 miles away, I take the highway to get there. It used a little over 3 gallons (and yes, I watch very very carefully) TODAY just doing this. This doesn't seem right? Also when I start the car, it ignites at 1500 rpms and it's super loud, so I'll put it into reverse, and it feels like something is dropping a little bit, and it gets quieter. Is it using too much gas to start??