According to Wikipedia, 20% of world energy expenditure is due to the impact of friction! I don't really quite understand where that number comes from. I'd have guessed far more than 20% for cars or aeroplanes, for instance (relatively little of it is due to acceleration or deceleration in either case)

Of course, even deliberate acceleration in a car is in some sense a friction effect - you're pushing off the ground. But I'm referring to the waste, which I presume is also what Wikipedia is referring to