E15 fuel is coming and while it may produce less harmful emissions it isn't exactly good for your lawnmower.

E15 is fuel the is 15% ethanol.  Users of lawnmowers, boats and motorcycles could face issues with their engines as they are not optimized to use this fuel.  In some cases water can be introduced into the fuel line and cause blockages and rusting to critical parts, like the carburetor.

It you use any of the affected equipment you are encouraged to use fuel additives to help maintain proper engine efficiency and life span.