See also:

Octane rating tips
Using unleaded gasoline with an octane rating lower than recommended can cause persistent, heavy “spark knock.” (“Spark knock” is a metallic rapping noise.) If severe, this can lead to eng ...

Drinking alcohol/drugs and driving
Never drive under the influence of alcohol or drugs. Alcohol in the bloodstream reduces coordination, delays reaction time and impairs judgement. Driving after drinking alcohol increases t ...

Speedometer
Speedometer The speedometer indicates vehicle speed in miles per hour (MPH) or kilometers per hour (km/h). ...