 After the 3RD/ 31k miles service I noticed the engine light is on and I took it to the dealer, as per dealer diagnose result ' misfiring or cylinder misfiring'.  I been following the manufacturer advice in terms of maintenance and using premium 91 gasoline.  The adviser from the dealer(since the car is still under warranty, I took it to the dealer)  blamed the ARCO premium 91 gasoline(verbally no written statement) and advised me to fix 'cylinder misfiring' which cost me $1,262.  Which does not covered under manufacturer warranty.  After 31k miles a major issue like this in the engine of VW I was shocked. I am wondering that's all VW can do in terms of manufacturing quality cars.  In my experience the cars which are considered to be lower grade than VW are doing far better.....my last Honda Accord started giving major problems like this at 100,000 miles.  ******************RIGHT NOW I REGRET MY PURCHASE OF VW TIGUAN*************************