Since hypermiling often limits the use of power steering and brakes, I would assume most people realize it's not the safest driving style, but AAA has issued an advisory just in case

With over 70 percent of Americans believing the price of gasoline will reach the $5 per gallon threshold by Labor Day, it isn't surprising the practice of "hypermiling" is gaining much popularity around the nation.  With more people engaging in the extreme fuel saving tactics, the AAA has issued a warning concerning the safety and legality of earning those extra miles.

If you're scratching you head wondering what the heck "hypermiling" exactly is, we'll explain: Some innovative (or reckless) drivers developed the idea to increase their EPA estimated gas mileage by practicing techniques such as cutting their engines while driving to coast in neutral when applicable, rolling through stop signs and lights when traffic is not busy and the most dangerous of all, tailgating bigger vehicles and semi-trucks in order to draft their slipstream of air.

"The goals of hypermiling are positive, such as eliminating aggressive driving and saving energy," said AAA Automotive vice president Marshall L. Doney.  "Unfortunately some motorists have taken their desire to improve fuel economy to extremes with techniques that put themselves, as well as their fellow motorists, in danger."  Should a surprising or unpredicted situation occur while hypermiling, Doney says drivers could face the challenge of not being able to react quickly enough to ensure their safety.

Source: MotorTrend / AAA