Toyota originally introduced a Camry running on compressed natural gas (CNG) back in 1999, but a limited refueling infrastructure (and cheap gas) meant demand for the model was low. Now that commuters are seeking alternative powertrains that save money at the pump, the automaker feels the market for such a vehicle is improving. Details on the new Camry are limited, but the concept combines an internal-combustion engine reworked to run on CNG with the company's signature hybrid system, which should yield excellent gas mileage with extremely low emissions. That said, some of the impediments to CNG from 1999 still exist today -- around 1000 refueling stations are sited nationwide, and just 500 are open to the public. Toyota hopes increasing the availability of CNG will highlight the need for more green infrastructure and provide a model for a future switch to hydrogen.

toyota camry