theres only one major thing i can guess of apart from the minor ones like tyre pressure n size etc.n its ECU REPROGRAMMING.
some of the cars of 2010 have a different ECU programming which leads to knocking and may be even bad fuel economy figures.
You should take it to some authorized honda dealer and ask them to reprogram the ECU by connecting it a computer.they usually do it free of cost, or atleast they used to do it free some time back.