Im using spark plugs which are the same as stock for my Lancer. Its been almost a year since Ive been driving them. No problem at all...My FC for my 1997 Lancer GLXi is 7-10 km/L (not bad for a lancer ;) )
I also heard that spark plug and oil changes should be reduced because LPG is cleaner.
Its possible though that if you do experience problems with your spark plugs, your engine could be running too leanly.





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