so i had a pretty bad experience with denso plugs, i probably got some fakes (even though i bought them from a good known shop).
car was acting up, one cylinder not firing properly.
so replaced a plug (just 10k run)
okay, better. But the new denso didn't look like it should for a brand new plug.
visited another shop, same there.
so i got NGK BP6EY v grooved (box says oem for toyota vehicles)
the tips were of much better finishing than the denso plugs. cost me 120 rs per plug.
car is behaving much better now with slightly better fuel average.
i suggest trying these, they are not expensive like the platinums advertised on pw (same cost as any other copper plug) and for some reason, i get the feeling that there is something fishy about the denso sold here.