SUV:
12,000 miles/yr x 1/14mpg x $4.00/gallon = $3428.58/yr (857.15 gallons of gas used).

12,000 miles/yr x 1/20mpg x $4.00/gallon = $2400.00/yr (600 gallons of gas used).

Savings of roughly $1000 or 257 gallons a year.

Sedan:
12,000 miles/yr x 1/25mpg x $4.00/gallon = $1,920/yr (480 gallons of gas used).

12,000 miles/yr x 1/36mpg x $4.00/gallon = $1,333.34/yr (333 gallons of gas used).

So only $586.66 saved and 147 gallon of gas saved.

My only point being here that although its still not worth the $10,000 premium for a hybrid suv, the saving are much more impressive than you think. And hybrid technology is far more beneficial for larger vehicles. I'm not saying people should go out and buy hybrid suvs for that reason, but for those who need a tahoe or a big suv, and are going to put a lot of miles on it, then the hybrid technology will pay for itself much faster than that in a car. Clearly, the greatest saving would be to move from an suv to a sedan hybrid. I personally would still like to see this type of hybrid technology be applied to a turbodiesel of small displacement and see what the savings would be!