Imagine on a bicycle, the tiny gear on the back is the OD (over drive gear).
Just like on a bicycle you may want the extra gear when ur going kinda fast and kind of steady, your legs will move slower but the bike is going fast.
That button makes the computer use the tiny gear, or it makes it not use the tiny gear.when it uses it the engine goes slower but the car is still moving fast.
Overall its hard to move a tiny gear when ur moving slowly.. so that’s why you turn it off or on on a bike and on a car.
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