A car can take a vehicle that weighs 2000lbs 35 miles on gallon of gas, but a lawn mower that weights 35lbs and has one spinning blade only goes 2 or 3 miles before needing a refill.
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Cars are designed to travel long distances down the road efficiently, whereas lawnmowers are designed to cut grass. You could just as well note that cars make very poor lawnmowers, despite being much more expensive.
Lawnmowers use most of the energy from burning gasoline to spin the blade and cut the grass. They could be far more efficient at traveling if you dispensed with the blade and used them only on a paved road.
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