I don’t understand how this is possible. The car engine is more efficient but the leaf blower would use a gallon or less of fuel that that amount of time as where the car would burn 30 to 40 times more that for the trip.
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Most gas powered tools are a 2-stroke engine, whereas cars and motorcycles are generally 4-stroke. In a car engine, the cycle is SUCK fuel/air into the cylinder, SQUEEZE to compress the fuel/air mixture, BANG which is where the fuel/air mixture is ignited and pushes the piston in the cylinder down, and BLOW which is where the returning piston pushes the exhaust out into the exhaust pipe where a a catalytic converter the unburnt fuel and other compounds are turned into safer compounds.
In a 2 stroke engine, the valves for the fuel and exhaust are always open, so you’re always pushing fuel into the cylinder even on the exhaust cycle. This results in a smaller, cheaper and lighter engine, which is great for someone holding a weed eater for several hours, but not so good for the environment.
A lawn mower engine might be 5 hp and perhaps under 10 pound-foot of torque, compared to a very small car engine which might be 100 hp and about 100 lb-ft of torque. Vastly different sized engines.
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