And the Most Efficient 425HP Muscle Car is...

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The obvious lesson learned here: better fuel economy numbers are directly related to how one drives.

When it comes to muscle cars, no one buys them with fuel efficiency in mind. To be perfectly honest, owners could care less. But what they do care about is horsepower. Lots of it. But in the recent Fleet World MPG Marathon, participants were challenged to drive some 350 miles through the British countryside all the while using the least fuel as possible. Now, many may imagine that something like a Smart car may be a top contender in this challenge.

A Toyota Prius perhaps? May be even one of those fantastic VW diesels? A horse and carriage perhaps? The answer is none of the above, as the Vauxhall VXR8 was the winner with the equivalent fuel economy of 26.7 mpg. This is actually 53 percent better than the mighty VXR8's official combined fuel economy of 17.5 mpg. Driven by Top Gear Online editor Chris Mooney, the car's solid fuel numbers can be credited to its modern 6.2-liter LS3 V8 with 425hp and 406lb-ft of torque. Top speed is electronically limited to 155mph and it go from 0 to 60mph in just 4.9 seconds.

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According to Mooney, "It just goes to show that the person behind the wheel can make a massive difference to fuel costs and carbon emissions." We couldn't agree more and it's a shame that the Pontiac G8 GXP no longer exists in the U.S.

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