[Spinal]

a lot of people on FF use the autolite 104 copper plugs and gap them to 0.55'' thats supposedly the better range. as far as im concerned the stock plugs which are good for like 100K (not 50K lol, at least thats what the manual says..) are probably good enough. a spark is a spark its not like the motor can tell the diff, for fuel economy, fine but replacing the copper plugs vs the gained mpg would probably balance out. i get 450kms to the tank all city driving, so if yours is mostly highway it should be well over 500kms. if we get a dyno day like last year im for sure going to test both sets of plugs the copper vs stock plat and see which yeilds more hp, if any.