Well, I installed CNG in my 2009 GLi when it was 15k driven. It occasionally use to cause me trouble when I used to switch it back on petrol. Would not take the accelerator properly and I would always have to reset the battery once to make it work properly on petrol.
However, now as it got to 105k, it suddenly started missing both on Petrol and CNG. This time i have gotten the CNG removed but I think I have gotten late since the mechanics have diagnosed a problem with the valves... Wish I had removed CNG in time...
Now planning to sell it off..
Yasir Hassan Maken