Without a doubt! Humans and life in general is uber efficient in terms of energy use. Most of the energy of a car is not directly spent for the work. Work is done when moving mass from a lower to a higher place and accelerating it to a higher speed. But once you have accelerated the mass to the cruise speed, it actually does not require any energy to maintain. Rather, the energy is spent by the car to heat up the air, move it around, wear the road and the tires, and make noise.
We use cars because they are muuuch more powerful than humans, at the cost of wasing a lot of energy. Try to push a car uphill, you won't ever succeed without pullies which makes it even slower. Doesn't matter how efficient you are if you cannot output the minimum power required to overcome friction etc.
That's pretty nice, it's basically additional leave days! I still prefer European style with unlimited sick leave, but you need a certificate from your physician.