Does over drive save gas?

-Lexus does over drive save gasYes, it is a higher gear ratio and can be used on long highway trips where you remain at a constant fifty high rate of speed (over 50) -- but not too fast because too fast uses gasoline at a very high rate. Higher gear is like the top gears on a bicycle. They take less effort for the engine to maintain the speed.
Sometimes but not always, esp if your not reving enough & your motor is struggling, or there's a strong headwind/hill/heavy load.