Joe 
2007 Nissan Sentra Sedan 2.0 S 4dr Sedan (2.0L 4cyl CVT)
Bad alignment, already has other issues
 We bought a Sentra with positive expectations but we were let down. 1. The gas mileage is nowhere near what Nissan claimed. For '08 the gov has revised the criteria, but it's still optimistic. We have averaged from 20 in the city to 27 highway. I drive to maximize mileage too. 2. The wheel alignment is all over the place. Fresh from the factory, the car was defective. After much trouble Nissan aligned the front, but added way too much caster in an effort to conceal the alignment problem. The rear is still not aligned. I suspect that bad alignment is part of the cause for the bad gas mileage. If you have a Nissan, take it to the dealer and have them check the alignment. I have a lemon!!!