Yes, I calculated the hybrid has less gas expense, over 10 years, 150,000 miles, with gas at $4.00 per gal.
Sorry I'l have to redo the calc.
Comparing a toyota corolla automatic with a prius automatic, about $6000 difference in initial cost. For mileage, city, highway, combined, Corolla gets 26, 34, 30. Prius gets 51, 48, 49.5. I averaged city and highway to get combined. Yes, the Prius actually get better mpg in city driving than they do in highway driving.
To go 150,000 miles, Corolla uses 5000 gallons, Prius uses 3030 gallons. At $4.00 per gallon, that is $20,000 vs $12,120 gallons. So Prius has $8000 less in gasoline costs. It also weighs a few hundred pounds more, and has slightly more interior space. It might be better to compare a Prius with a Matrix, which is a bit more like a Prius, both outside and inside, and has similar interior space. And has slightly less gas mileage, than a Corolla, due to inferior aerodynamics.
Things don't look as good if you compare a Camry regular with a Camry hybrid, where the mpg specs are city, highway, combined, 22, 32, 27, and 31, 35, 33. Here the hybrid saves only $4,040, over 150,000 miles, yet the initial price of the car is about $5,800 more. Both the hybrid and the regular have 101.4 cu ft passenger space, but the regular has 15.0 cu ft luggage space, and the hybrid has only 10.6 (the batteries have to go somewhere).