If you drove the same distance at the same speed with the same load, it would be alot closer. But your lawnmower is also spinning blades and cutting grass. This is a tremendous load for such a small engine. The equivalent to the car would be hard to make but it would be like driving at full throttle all the time. The mileage would be going down tremendously at that load setting as well.
Cars are also fuel injected and optimized for fuel economy. Your lawn mower is basically the same since the 60s. Technology has not changed much during that time for a standard lawnmower.
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