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Also know that when your foot is off the accelerator pedal and the car is coasting, you use no gas
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What, exactly, is powering the cylinders, then? If you were using no gas, the engine would immediately die. You are using less, simply as a result of a lower revolution speed of the crankshaft; but no less than idle.
My general rule of thumb, soma, is if you're stopping at a red light from 55 or less, both pedals in. You're stopping quickly enough that you don't need to downshift through the gears. If you're slowing from 70 or less and anticipate accelerating away (light turns to green) or are decelerating for a corner, downshift.
And most importantly, if it's an emergency stop, BOTH PEDALS in. They burn that you into training for the track. In a spin? BOTH FEET IN! Saves destroying the transmission in the event that you spin completely around.