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

Saturn Aura Green Line Hybrid

Base Price (inc. dest): $25,965.00
Tax Credit: 1,300.00
Adjusted MSRP: $24,665.00
Premium: $3,610.00
MPG: 24/32 (city/hwy)
MPG Benefit: 2
Combined MPG: 27
Annual Gas Cost (15,000 miles, $4.20 per gallon): $2,333.33
Gas Savings: $186.67
Years to Payback: 19.3
EPA Pollution Rating: 6
Compared to: 2007 Saturn Aura XE
Base Price (inc. dest): $21,055.00
MPG: 22/30 (city/hwy)
Combined MPG: 25
Our Take: “Offering only a slight fuel economy advantage and requiring more than 19 years to pay for itself, this Saturn hybrid is a hard sell when compared to the regular four-cylinder Aura sedan.”

Details, Price Quotes:
Saturn Aura Green Line Hybrid