So jpadc's Prius has cost him 1697.67 Gallons of gas over 6 years. Don't know what you pay for a gallon of gas so I cant compute that.
But if its converted to liters, and gas is calculated at 1.40/ltr, it comes out to $10,790.39. or $1,798.40/yr. I could buy lots of Christmas presents with that...