I bought my hybrid in June of 2009 and as you can see by my mileage, practically live in it. It is a die hard. I have put on 2 sets of tires, but only one set of brakes and as of six weeks ago I'm no where near having to replace what the brakes. I drive in the mountains and on highways, so this car has seen just about everything. The only negative is the gas mileage. The difference between a regular Altima and what I had to pay for the hybrid will never be realized. In addition, oil changes and maintenance are a lot more. Would I buy another hybrid? Probably not. Would I buy another Altima? Yes.
We have had our 2009 NAH since June 2009. The on-board computer for mileage runs high, as many have noted. I just completed tallying my mileage after recording miles and gallons at each fill-up. After 24,000 miles, I have averaged 34.74 mpg, through all seasons, right in line with EPA estimates. With gas here at $4.20/gallon, I'm feeling fine. Overall, it runs like any gas-powered car. The shift from gas to electric is very mild and not an issue. The rest of the car is quite fine: good comfort, good power, good feeling of safety. Yes, the trunk is a bit small but that's the price for a hybrid. And I LOVE the fact that it goes into electric at the VERY long stoplights where I live.
It's a good car, with excellent MPG - I can get 37/g except in winter. How ever there are some issues. Internal design looks cheap, the Panic button is annoying (it's so easy for the horn to shout out). And just got an issue with the ignition switch: I could not start engine some times, and I was told I need $600.0 to get it fixed by the dealer!
Purchased a NAH in late 2009, and it just clocked 36,000 miles. It has been a great car. Although the MPG not quite as high as the Honda Civic previous car, the joy factor with this car is much higher. Very comfortable, solid handling, very peppy, and better in snow. Averaging about 35 MPG in NH summer and 31 MPG in winter -- EVT takes quite a while to activate in winter due to battery temperature sensor. Make sure there is a Nissan Hybrid authorized repair technician in your area; normal technicians are not allowed to work on NAHs.