Its quoted to replace the BKR6E-11 amongs some. It has no heat range specified though and you have to gap it to 1.1 if ever.

I also use BKR6E-11 or BKR6E GP as well.

Hey, 7.8km/L isn't bad given the kind of car you have. I'll gas up later this week to find out my FC with the new plugs. Performance-wise, engine seems to be happy with it; the car reached an indicated 190kph at 6K rpm on a generally level road.

BTW, NLEX seems to have switched speed camera cars, it was an beige/grey unmarked Crosswind XT i saw staking out speeders on the hot spot in Bulacan.