I use an injector cleaner every spring , even though I ride some during the winter the gas stays in the tank longer in the winter than summer. Todays fuels have cleaners in them but with todays gas prices fewer people are buying premium fuel so chances are you are buying gas that's been at the station longer than in the past. Maybe it just a feel good thing, but I figure a shot of cleaner every 5000 miles ain't a bad thing.