Air–fuel ratio meter
= Air–fuel ratio meter
{wiki=Air–fuel_ratio_meter}
An air-fuel ratio meter is a device used to measure the proportion of air to fuel in an internal combustion engine. The air-fuel ratio (AFR) is a critical parameter for optimizing engine performance, fuel efficiency, and emissions. In typical gasoline engines, the ideal stoichiometric air-fuel ratio is around 14.7:1, meaning 14.7 parts of air to 1 part of fuel by mass.