The Chevrolet Tahoe Hybrid for 2009 has taken a quantum leap in how we think about big 4x4s. The Tahoe for 2009 combines electric power with a fuel-efficient V8 engine to improve gas mileage by 25 percent. The conventional power source is a 6.0 liter 332 horsepower V8 engine. Fuel economy for the 2009 Tahoe hybrid ranges from 20 MPG in the city to 22 MPG on the highway.