A bit of a misnomer, actually. But, considering that the anatomically accurate saying would be ‘left bit of your right foot and right bit of your right foot’, you can see why the heel-and-toe adage stuck.
Put simply, it’s a way to avoid the traditionally jerky feeling as you change down gears in a manual car by revving the engine to match engine speed and road speed. Put altogether too simply, it is a thing you do in your car to drive it good-er.
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