From fuel prices to tax credits, which hybrid pays you back?

Nissan Altima Hybrid

Base Price (inc. dest): $26,140.00
Tax Credit  $2,350.00
Adjusted MSRP:  $23,790.00
Premium:  $2,160.00
MPG: 35/33 (city/hwy)
MPG Benefit: 8
Combined MPG: 34
Annual Gas Cost (15,000 miles, $4.20 per gallon):  $1,852.94
Gas Savings:  $570.14
Years to Payback: 3.8
EPA Pollution Rating: 9.5
Compared to: 2007 Nissan Altima I4 S
Base Price (inc. dest): $21,630.00
MPG: 23/31 (city/hwy)
Combined MPG: 26
Our Take: “Give up less than 20 horsepower and less than 20 lb.-ft. of torque and gain seven miles to the gallon -- not a bad deal."

Details, Price Quotes:
Nissan Altima Hybrid