This makes RPM a primary factor in determining transmission shift points for maximum performance or fuel economy. On new cars ...

A transmission changes gears depending on speed and accelerator input (i.e., how far down you push the pedal) so that the engine’s RPM or “revolutions per minute” are kept appropriately low. This ...

Cars need transmissions because of the physics of the gasoline engine. First, any engine has a redline — a maximum rpm value ...