Editing Engine braking (section)

== Limitations == 

Engine braking is a generally accepted practice and can help save wear on friction brakes. It is even used in some motor sports to reduce the risk of the friction brakes overheating. Additionally, [[fuel injection]] engines generally do not use fuel while engine braking. This is known as deceleration fuel cut-off (DFCO).

Although no longer in production in most countries, there are still plenty of [[carburetor|carbureted]] engines in service, with which engine braking is still consuming the fuel. At high engine revolutions and closed throttle valve the high manifold vacuum sucks more fuel through idle bypass than at true idle. Nevertheless the safety aspect of engine braking nearly always outweighs this minuscule fuel consumption.