A company called CT Hydro thinks it knows. It is developing fuel cells which convert water with electrolytes into hydrogen. The company says the result is a cleaner burning fuel with virtually no emissions and much better mileage. One fuel cell car owner says her mileage has improved 15 percent.
"We've noticed that there has been a reduction in the amount of times we have to fill the gas tank and it's worked out very well. The car has more power, so it's been good," said Elaine CoFrancesco, a fuel cell car owner.
Fuel cells are considered too expensive to mass market, but Toyota is predicting the price will drop dramatically by 2015.
So perhaps that's what's next.