If you buy a new Duacti in Thailand you will be told not to use Gasohol as it will damage the plastic tank ....thats an official statement from main dealer.
Now it may be that one has to use gasohol sometime as regular 95 and 91 RON octane fuels are not always available but then one is told to fill tank up with regular gas as soon as possible and to store the bike with regular gas and not Gasohol in the tank ....its only 5% in Thailand same as UK not the 10% stuff in USA but thats what the dealers are telling new owners.
Now it may be that one has to use gasohol sometime as regular 95 and 91 RON octane fuels are not always available but then one is told to fill tank up with regular gas as soon as possible and to store the bike with regular gas and not Gasohol in the tank ....its only 5% in Thailand same as UK not the 10% stuff in USA but thats what the dealers are telling new owners.