GripperDon,

AC is a killer of MPG in all cars. You loose 15% to 20% with it running full blast.

Over the past few weeks we have had several days in the 90's and have kept our MPG at 36.2 by only turning the AC up to about 1/3 on the worst days and rolling down the windows when we can.

Camrys have the same MPG rating the Altima has in "normal" use.