Really small 2 strokes (like leaf blowers) use mixed oil-fuel which is absolutely terrible for emissions. To make a 2 stroke meet emissions while maintaining i

Really small 2 strokes (like leaf blowers) use mixed oil-fuel which is absolutely terrible for emissions. To make a 2 stroke meet emissions while maintaining its primary gain - thermal efficiency, and matching the power density a lot of complexity is needed. This quora post[0] largely sums that up, but quora is only so trustworthy. [0] https://www.quora.com/Why-arent-2-stroke-engines-used-in-cars https://www.quora.com/Why-arent-2-stroke-engines-used-in-car...