tjf 
2008 Nissan Altima Hybrid Sedan 4dr Sedan (2.5L 4cyl gas/electric hybrid CVT)
6-Month Update on my Altima Hybrid
 Total miles: 4,030.  Avg mpg: 32.38. Total miles will easily double/triple in 2009.  I came out of a 1999 V6 Toyota Camry. The Altima is nice but the Camry tracked and drove smoother. The power just flowed effortlessly and I could get up to 30 mpg hwy and 18-20 city. The 'premium' I paid for the Altima Hybrid has yet to be of benefit so think through your driving style and driving demands.  I also considered the Ford Escape Hybrid for the huge advantage of cargo space and functionality.  I decided ultimately on the better gas mileage Altima (by 3 - 5 mpg) was worth more since gas was over $4/gal at the time and there was talk of going to $5/gal. The $2350 tax credit helped the decision too.