Hi I have the 2015 model so am not familiar with your particular version but the symptoms you describe do sound worrying.
The fuel economy sounds a bit low and and although I would expect some vibration under hard acceleration if it is excessive I would get it checked out.
I get around 45 mpg (about 6.3 litres per 100 km) under fairly hard riding and over 50 mpg if pottering around at low revs.
As a first step I would check the coolant and oil levels and also that the cooling fans are working if it has them.
It may be worth pointing out your concerns to the dealer you purchased the bike from or if you bought it privately have it assessed professionally.
I hope you get it sorted out.
Gary
