Often, the fuel economy suffers from our right foot (gas pedal). In other words, if we push the car to its limit, the fuel consumption is extremely high and if we drive carefully at lower revs, the economy will be more than satisfying.

Here in this test, Mike Duff and Vicky Parrott will test two completely different cars.

The first one is Porsche 911 Turbo S with 3.6 liter twin-turbocharged flat-six engine with 510PS and 620Nm (457 lb-ft). It accelerates from 0 to 100 km/h in 3.7 seconds. The car is equipped with PDK gearbox, sport exhausts, and other such options as standard.

The second is Peugeot RCZ HDi with 180HP and capable of returning more than 50mpg.

Find out, which car is more economical, when it comes to racing in the video below. Enjoy!

2010 Peugeot RCZ, 1 of 7
2010 Peugeot RCZ, 2 of 7
2010 Peugeot RCZ, 3 of 7
2010 Peugeot RCZ, 4 of 7
2010 Peugeot RCZ, 5 of 7
2010 Peugeot RCZ, 6 of 7
2010 Peugeot RCZ, 7 of 7

2010 Porsche 911 Turbo S, 1 of 6
2010 Porsche 911 Turbo S, 2 of 6
2010 Porsche 911 Turbo S, 3 of 6
2010 Porsche 911 Turbo S, 4 of 6
2010 Porsche 911 Turbo S, 5 of 6
2010 Porsche 911 Turbo S, 6 of 6

source: Autocar.co.uk