2019 XTown 300i----I tend to use Shell Super, when available, otherwise super seems to work well-----since most of its miles are run at high speed and engine working hard......but it also seems to run on any reg, too. Cost difference is little. In US, hand book on required fuel not so clear, as there are 2 ways of rating fuel octane.….and they seem to go with higher----maybe new Euro 4 requirement, requires super-----if managers in the bike business rode everyday....things in hand books would be clarified!!
On trips I fuel often between 100 and 150 miles. Haven't run out on road since Helix in NM ( camp stove gas got me to station) or Japan Hokkaido, Kawasaki 90----big hill let me coast into station. I do not like to walk. In N America only one place I know of where carrying spare gas is necessary, is the James Bay Road in Quebec. I think 240 miles to station. Of course Vespas need to carry spare gas just to function daily in serous use.