Jim Drummond 
2011 Nissan Altima Sedan 3.5 SR 4dr Sedan (3.5L 6cyl CVT)
Better than expected
 I have the 3.5 Liter V-6 and it is a plenty fast enough for me. The CVT, while trouble prone, has gone 90,000 miles. Replacement cost is high. I have driven friend's "luxury cars" and the Altima handles just as well. Getting 23-24 in town and 28-29 on the highway. Not bad for a powerful V-6. I bought it used with 9,000 miles and just turned 90,000. Engine light came on at 80k +. Turned out to be a "Mass Air Flow Sensor" that set me back over $400.00. Until this recent repair it has mostly been routine items such as; the air filter, battery, cabin filter, tires and regular oil changes. As a "Certified Used Nissan" I have the 100,000 mile power train warranty however I learned to my dismay that it does not cover "electrical components" such as the aforementioned air flow sensor. Turns out that only the dealer has the computer codes necessary to re-program a new part. Ditto the CVT. While supposedly under warranty, the local dealer will not honor it until it stops completely. Right now it's just a mild vibration.  I will not use the dealer again. Not only do they contradict Nissan corporate but are not even very nice about making appointments.