Not today, but took the boat out yesterday for the 2nd time this year. First time was last weekend. 1st time in 4yrs! And, on 4yr old gas! Ran like I had just started it. Gotta love FI. It's a Johnson 4 stroke. Guessing it's easier to burn older gas with FI, no carb to plug up.
4yrs ago I just dumped Seafoam in the tank. I also ran premium. Not sure if I just got lucky, or, the previous mentioned helped. But, I will always use Seafoam and premium. Btw, tank was half full. Ran it down to under a quarter and topped it off with premium and a can of 'Foam. Need to replace the filters just for safety sake...