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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because the motor is more efficient in a car. This efficiency cost a lot to research and a lot to build motors in such a way. Measured against the price of a car and 5he amount of cars sold ajd the amount of fuel the owner buys in the lifetime of thr car, this is a reasonable investment. Not so much with cheap, relatively sparsely used lawnmowers. Also Mowers should be simpler in construction in order to be more resilient and easy to (self) repair
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