My bike sat for most of two years before I bought it this past August 31st, and I hadn't done anything to the fuel system except put some Stabil in the fuel and keep it filled with ethanol-free gas when riding near home and when I could find it on the road. However, the last couple of rides I made on it, I had to fill it several times with E10 gas. The Yammie mechanic here talked me into trying a couple of 1 ounce bottles of Bel-Ray All In One fuel treatment. I dumped one in the tank (that had about 2/3 to 3/4 tank of E10 gas in it) about a month ago before making an 80 mile afternoon ride, and hadn't ridden it since.
Yesterday evening, I siphoned as much of the ethanol-laced gas out of the tank as I could and refilled it with ethanol-free 91 octane gas, plus Stabil and the other 1 oz. bottle of Bel-Ray All In One Fuel Treatment. I wanted to ride it for a while today and get all the ethanol out of the FI system and warm it up good to cook off any condensation in the crankcase. But a storm was blowing in early this morning, so I took it out for a nighttime ride last night before the rain started. It was a damp 37 degrees and windy. First time I've ridden in weather that cold in decades.
Put on a hoodie and a heavy Carhartt coat, my Rocky hunting boots, a pair of insulated gloves, raised up the windshield to the highest position, zipped hoodie and coat up tight against bottom of my helmet, turned on the grip heat, and off I went. I LOVED it! I stayed out longer than I had planned. Hands stayed toasty warm with the grip heat set on 2. Had on a pair of Wrangler jeans, with no base layer underneath, and knees got a little cool, but not enough to send me home. Everything else stayed warm, also. I could have easily ridden a couple hundred miles, but didn't want to worry the wife too much, so came home after about an hour.
HOWEVER, on the ride, I soon noticed that the engine was running noticeably smoother and pulling better than it had been before. Soon I turned onto a straight stretch of highway, and I turned her loose and let her eat for a bit. HOLY CRAP! She took off like a striped assed ape! WAY better than before. Even in a 5th or 6th gear roll-on from around 50 mph there was a big difference. I was amazed at how much better my S10 runs now.