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Well 60 miles at 60mph means that you will get there in an hour. However if you travel it 50 mph the journey will take you a little longer - one hour and 12 mins. but you will have used much less fuel because wind resistance will be less (air resistance is not linear, with a doubling of speed the wind resistance quadruples).

As the world needs to use less fuel those extra 12 mins are worth it so it is better driving at 50 mph.

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12y ago

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