I aggree with Allan I would not even put LRP in my mower , I have been reconditioning cylinder heads for some time now and have seen the damage that LRP does to the valves and seats , I always advise people to only use PULP which will increase power and fuel economy , It is true that unleded fuel runs a lot hotter than leaded fuel which can damage your valves and seats , but you can not get leaded fuel anymore , And what I have seen this LRP seems to run even hotter and do more damage than PULP !