However, the results of the study depend critically on how much driving you do and the price of gas. The big disadvantages of the hybrids are depreciation and initial cost. Those don't get worse if you drive more miles or if the price of gas goes up. But their advantage, namely lower gasoline expenditures, goes up as you drive more or the pump price rises. So although the hybrids do not save money as well as gas for a typical driver at today's prices, they very well might at tomorrow's higher gasoline prices.
The lesson we can learn from this study is that saving on gas does not automatically mean saving on total cost of ownership; instead you have to figure in your miles driven and the price of gas.