The CVT and CNG DONT work together.. if u do some research on CVT.. u will get to know that it is a fairly simple technology..but the problem is that the size of the gear is changes, with speed. The only problem on driving in CNG is that you lose some power on CNG,..and somehow that effects the timing of ur transmission..
in my experince the transmission will start slipping after about 50k kilometers..or u will have to keep it in best tunning all the time..a freind of mine had a 2008 CVT.. and had to sell it coz of the same reason..The transmission literally starts slipping.. u hear the sound of gr gr gr.. wen u park on the signalss.. *** per my experience CVT and CNG. not gud if put together..