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Remember most containers of injector cleaner have enough to treat several tank fulls on a bike. I run a little Sea foam through once mid season and when Winter approaches.
I have used Amsoil's PI and any other cleaner that's on sale, but I usually wait for Techron to go on sale...never heard a bad thing about it--just good.
Yes, gas, especially premium has cleaners in it, but what if you happen to fill up when the stations tanks are low or just after a tanker has filled the tanks and all that sediment is stirred up.
i do what some others have said and treat a tankfull 2 or 3 times a year.
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