http://www.automotive.com/auto-news/02/37241/index.html
AAA Advises Hypermilers to Avoid Dangerous Fuel-Saving Techniques - Auto News from June 27, 2008
Examples of the dangerous hypermiling techniques include cutting off the vehicle's engine or putting it in neutral to coast on a roadway, tailgating or drafting larger vehicles, rolling through stop signs and driving at erratic and unsafe speeds. "These practices can put motorists in a treacherous situation where they could lose power steering and brakes or be unable to react to quickly changing traffic conditions," Doney said.