Hybrid-powered vehicles may warm the green-hued hearts of their owners, but they also tend to lighten owners' wallets. Sure, they'll save you money on gas, but typically, you have to pay so much more up front for hybrid technology that you'll never recoup that initial investment. The 2010 Toyota Camry Hybrid is the rare exception to that rule. Thanks to a dual-mode gas-electric hybrid powertrain, its green credentials are impeccable -- 34 combined mpg and Advanced Technology Partial Zero Emissio