Interior light

Do not use the interior lights for extended periods when the engine is not running. It may cause battery discharge.

See also:

40 MPG POWERTRAIN
Under the hood, the Hyundai Elantra is powered by an all-new 1.8-liter Nu four-cylinder engine with 148 horsepower and 131 lb-ft of torque (145 horsepower and 130 lb-ft of torque for Elantra PZEV) ...

Coolant
The coolant should be changed at the intervals specified in the maintenance schedule. ...

If the Engine Overheats
If your temperature gauge indicates overheating, you experience a loss of power, or hear loud pinging or knocking, the engine is probably too hot. If this happens, you should: 1. Pull off the roa ...