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

Chevrolet Tahoe/GMC Yukon

Base Price (inc. dest): $50,490.00
Tax Credit:  $2,200.00
Adjusted MSRP:  $48,290.00
Premium:  $2,665.00
MPG: 21/22 (city/hwy)
MPG Benefit: 5
Combined MPG: 21
Annual Gas Cost (15,000 miles, $4.20 per gallon):  $3,000.00
Gas Savings:  $937.50
Years to Payback: 2.8
EPA Pollution Rating: N/A
Compared to: 2008 Chevrolet Tahoe LT3 with Sun, Entertainment Package
Base Price (inc. dest): $45,625.00
MPG: 14/20 (city/hwy)
Combined MPG: 16
Our Take: “If you can afford almost 50 grand for a vehicle and must haul people and cargo, take a look at the Tahoe Hybrid."

Details, Price Quotes:
Chevrolet Tahoe Hybrid