I filled up with regular (85 octane) and have noticed no complaint from the engine. I just replaced my fuel pump damper and mesh filter for ones said to be ethanol resistant. (

www.tills.de). Regular is $0.25 per liter cheaper than super so a saving of $5 per tank-up would quickly pay for the replacement parts. I may do this. Heresy, I know. The original damper was a bit deteriorated after 160,000 km; the old mesh was fine. The bike has always used only ethanol-free gas.

I also bought new fuel hoses to replace the originals. The old hoses still look fine but as I have new ones I'll put them on.

The tank took 18.1 liters after travelling 392 km. That's 21.6 km per liter. So the remaining 2.9 liters in the tank would have taken me another 63 km, a total of 455 km or 284 miles -- assuming all of the tank's contents is usable and I don't turn or accelerate when there is only a liter or two remaining.