Misfiring - The failure of the air/fuel mixture in one or more cylinders to ignite while the engine is running.
MPG - Miles Per Gallon
MPGe - Miles Per Gallon Gasoline Equivalent, a term used for the mileage range on electric vehicles.
MPV - Multi-purpose Vehicle, aka a minivan
MSRP - Manufacturer Suggested Retail Price
Muffler - Deadens the noise of the engine.