With gas prices now officially in the stratosphere, many motorists are taking extreme measures to squeeze more MPGs out of their petrol-starved cars and trucks.

While prudent, gas-savvy driving habits are advisable, the American Automobile Association (AAA) warns drivers to refrain from fuel-saving techniques that could put them or others in harm's way. Known as 'hypermiling', such dangerous and often unlawful driving practices may include tailgating or drafting larger vehicles, rolling through stop signs, or shutting off the vehicle's engine entirely while in motion. Techniques like coasting in neutral gear are more controversial, since experienced drivers -- particularly those operating cars with manual transmissions -- may be able to apply them safely.

"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," said Marshall L. Doney, AAA Automotive vice president, suggesting that instead drivers use safe and legal approaches, such as "smooth and easy acceleration and braking, maintaining a steady speed, using cruise control and looking ahead to anticipate changing traffic conditions."