Scott D. 
2010 Nissan Altima Hybrid Sedan 4dr Sedan (2.5L 4cyl gas/electric hybrid CVT)
Thoroughly Satisfied
 I have had this car for 9 days.  I am thoroughly satisfied to say the least.  My first tank of gas lasted 651 miles and I got 37.1 MPG.  I would characterize my driving style this 1st week at light to light-moderate.  With moderate driving I would expect more like 33-35MPG, excellent for a car this size. Last car was an '08 Sentra.  No problems and it had 63,000 miles.  I upgraded due to 4K Nissan cash back and 2,350 federal tax cred on the hybrid.  Comparing this car to the Sentra is almost pointless.  Sentra was high revving with the CVT and a bit small for me.  The Altima is far more comfortable and gets up and performs with ease.  I expect reliability on par with the Sentra.