This is just to share my experience related to the fuel efficiency of "Honda Grace", I've been using a Grace since 2017 normally it does 30KM/L when long run like A/Pura-Kandy, A/pura-Colombo. So far it has done 60K+ and average shown is 21+KM/L.
I've faced no Dual Clutch issue yet, and hope no in future.