Bro ur getting very gud mileage, u must have very best tuning, best of luck for ur xli ........
first of all , i use 60wl cylinder cos i have long drives to my village from isb, its quit far , so i need maximum gas to use on road.
secondly if u own a xli , then u should know that of getting ur dash board top off, u need 2 mins ........ take a look at ur car ......
thirdly for big cars like corona , creseedia's, i dont prefer to even install a cng kit in them, cos its not for those big cars, its of small cars like ours, ...... dont tell me u like ppls who spend 400k on parado's and standing in row for getting cng .
fourth , if u read carefully above, there i mentioned, there is no need to touch the adv or emu, all setting will be done by the kit ,. for idle and mixture setting. All the advancing required by corolla is known by them and they set it once and it is final , till now my car is running fine, i will let everybody knows if i get any prob regarding adv or emu of the kit.
the reason they install adv & emu in dash is for some easy and safe connections to wires and for long life of electronics, instead of in engine bay, like somebody washing throws water over heat damages . Got the point .