2010 Hyundai Elantra Owner's Manual - Page 223

Driving your vehicle • Use your air conditioning sparingly. The air conditioning system is operated by engine power so your fuel economy is reduced when you use it. • Open windows at high speeds can reduce fuel economy. • Fuel economy is less in crosswinds and headwinds. To help offset some of this loss, slow down when driving in these conditions. Keeping a vehicle in good operating condition is important both for economy and safety. Therefore, have an authorized Hyundai dealer perform scheduled inspections and maintenance. WARNING - Engine off during motion Never turn the engine off to coast down hills or anytime the vehicle is in motion. The power steering and power brakes will not function properly without the engine running. Instead, keep the engine on and downshift to an appropriate gear for engine braking effect. In addition, turning off the ignition while driving could engage the steering wheel lock resulting in loss of vehicle steering which could cause serious injury or death. 5 31