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 and lawn-mowers are designed to serve different purposes. Cars are a means of conveyance. Lawn-mowers cut grass.
Cars may consume a gallon of gasoline every 35 miles traveled, but how many blades of grass do they cut for that same gallon of gasoline? (hint: it’s zero) Thus, even though a car may be several orders of magnitude more efficient than a lawn mower at getting you from one place to another (assuming the lawn-mower is self-propelled and you ride on top of it), in terms of cutting grass, a lawn-mower is infinitely more efficient than a car.
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