The most fuel effincient car is the Honda Hybrid.
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Hydrogen-fueled cars such as the Honda Clarity FCX and new H2 Mazda RX-8 don't even use gasoline/diesel.
Volkswagen Lupo 3L uses 78 miles per US gallon or 94 miles per Imperial gallon.
Fuel efficiency is often confused with fuel economy. If you drive a Toyota Prius like an angry teenager, you probably get worse fuel economy than if you drove a BMW 325i like a 45 year old schoolteacher, even though the BMW has far worse "fuel efficiency".
The most dependable fuel efficient car of 2014 is the Ford Focus.
The 2014 Chevrolet Volt is the most fuel-efficient small and mid-size passenger car.
The most fuel efficient used car is the 2004 to 2006 Toyota Scion. It gets 30 miles per gallon combined.
Click the link.
Hyundai
diesel will be powerful
The Most Efficient Car is The Electric Car sports Car that recently came out. The last answer was terrible so i changed it but this one is probably worse.
A car has to be fuel efficient. It means it has to completely burn the fuel.
The beetle is a fuel efficient car. 25 in the city and 32 on the highway makes is fuel efficient.
Any car that is labeled as a "hybrid" is going to be more fuel efficient. Some of the most fuel-efficient cars of 2011 are the Nissan Leaf, the Telsa Roadster, the Chevrolet Volt, the Smart car, the Toyota Prius, and the Honda Civic Hybrid.
The most fuel efficient vehicle on the road as of the present is the Toyota Prius. National statistics state that consumers are extremely happy with this vehicle.
I think it's the pac-car 2