Had a mis-fire recently in my 2001 twinnie which after new plugs,borrowed coils and leads seemed to have disappeared but ever since my fuel consumption has dropped from 28mpg average to around 22mpg

.Performance feels as norm ,no flat spots,or hesitation.No scary orange light to speak of so i"m a bit confused.
Could the mis-fire have knocked out one or three of the lambda sensors? please help
