If you are going to buy a Hybrid car only for cost advantage then a marginal gain could be achieved with this car. Please have a look at this data:-

Lets assume you drive 15,000 miles a year. The fuel consumed with an average non hybrid car would be around 430 gallons and with an estimated price of fuel per gallon be $2, total cost for the fuel would be $860.

If you drive an average hybrid car with the same number of miles the fuel consumption would be around 312 gallons meaning $624 worth of gas.

This means you save $236 on gas. But with the price of gas going uphill this gap could increase. Now look at the other factors,

1. Fuel saved meaning less dependence for fuel on other countries.
2. Due to less emission less damage to environment.
3. Tax deductions on hybrid cars.

In my opinion buying a hybrid car has more advantages then disadvantage. Go ahead and buy your next car as a hybrid car.