Top-10 Most Fuel-Efficient Cars In the world

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