Engine: 1.8L DOHC I4 Hybrid
Manufacturer: Toyota Motor Company
Fuel: gasoline
Horsepower: 98 HP @ 5200 RPM
Torque 105 lb-ft @ 4000 RPM
Fuel Economy (city/highway): 51/48 MPG
What we say: We're pretty sure the 1.8-liter four in the Prius is on the list because it does return spectacular fuel economy — it's hard to argue with 51 MPG city and 48 MPG highway on gasoline. You can argue with the engine's buzzy nature and unpleasant CVT transmission. Can't have everything.