It’s a good idea, of course, to try to save on fuel. The problem comes when people who don’t know what they’re doing seize on what they think are the principles of hypermiling, leading them to adopt dangerous tactics, such as driving too slowly in traffic, tailgating larger vehicles or “drafting” (driving in another vehicle’s slipstream to reduce wind resistance) too closely, rolling through stop signs or making turns without using the brakes.
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Source: MSNBC