Top-10 Most Fuel-Efficient Cars In the world -2009

Toyota Prius

Base MSRP: $22,000

Gas Mileage: 46 mpg (45 city, 48 highway)

Horsepower: 76 gas, 67 electric

Volkswagen Jetta TDI

Base MSRP: $17,340

Gas Mileage: 34 mpg (30 city, 41 highway)

Horsepower: 140

Hyundai Elantra

Base MSRP: $15,120

Gas Mileage: 28 (25 city, 33 highway)

Horsepower: 138

Mercedes-Benz E320 Bluetec Base MSRP: $55,075

Gas Mileage: 26 mpg (23 city, 32 highway)

Horsepower: 210

Chevrolet HHR LS FWD

MSRP: $18,720

Gas Mileage: 26 mpg (22 city / 32 highway)

Horsepower: 155

Audi TT Coupe (Sports Car)

Base MSRP: $35,200

Gas Mileage: 26 mpg (23 city, 31 highway)

Horsepower: 200

Audi A4

Base MSRP: $30,700

Gas Mileage: 25 mpg

Horsepower: 211

Acura TSX (Upscale Sedan) Base MSRP: $28,960

Gas Mileage: 25 mpg (21 city, 30 highway)

Horsepower: 201

Audi A4 Cabriolet (Convertible)

Base MSRP: $40,750

Gas Mileage: 25 mpg (23 city, 30 highway)

Horsepower: 200

Chevrolet Impala LS (Large Sedan) Base MSRP: $23,790

Gas Mileage: 23 mpg (18 city, 29 highway)

Horsepower: 211