Watch Hennessey drag race McLaren 765LT against 720S

If you're behind the wheel of either a McLaren 720S or 765LT, then things are going well for you. However, a new video from Hennessey highlights the difference in performance between these six-figure machines.

With 710 bhp (529 kilowatts) from a 4.0-litre twin-turbo V8, the 720S is far from an underpowered vehicle. The factory specs say that it can reach 60 miles per hour (96 kilometres per hour) in 2.8 seconds and a top speed of 212 mph (341 kph).

The 765LT takes the 720S and turns up the heat. Its 4.0-litre twin-turbo V8 has 755 bhp (563 kilowatts) and weighs 62 kilograms (136 pounds) less than the basic version. According to McLaren official specs, it gets to 60 mph in 2.7 seconds, but the performance improvements increase as the speed grows. The automaker claims the Long Tail hits 124 mph (200 km/h) in 7.0 seconds. The supercar covers the quarter-mile in 9.9 seconds, and on a prepped strip, this time can be even lower.

The first drag race starts from a stop. As you might expect, it's no contest. The two vehicles are briefly side by side. Within a few feet, the silver 765LT speeds ahead and stays there throughout the distance. There are a couple of car lengths between them when the supercars cross the finish line.

The next race is more interesting. They race from a 45-mph (72-kph) roll. However, the speedometers in the video show closer to 50 mph (80.5 kph). The 765LT is in third gear, and the 720S is in first. You might expect the lower cog to give the less powerful vehicle a little help, but it's not enough. The Long Tail scores another victory. The distance between them appears closer, though.

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