Waleikum Assalam.
I have Aspire 1.3 prosmetic September 2016...
and i am having 11-12.5 in city avg ... and 16-17 on long (LHR-Shkhupura).
i m using High Octane from very first drive.
( just keep your pedal/foot light)
(What ill going to do next is changing my tyres to Yokohama)