I have had similar experience. I prefer Autolite myself as my ET stays consistent longer with then then the NGK's. The NGK would run .01 faster, but would start to fall off by the end of the day or weekend (depending on how many passes I got in each day). I could take my old Autolite plugs and put them back in and the ET would be right back where it was before. I have not used NGK plugs in my daily drivers as autolites work just fine for me and the price seems to be a little better.Coloradoracer wrote: ↑Wed Nov 21, 2018 8:36 am I run both Autolite Racing and NGK racing plugs in my stuff. I prefer the NGK when I'm tuning, they are much easier to read than the Autolites. Once engine is happy, I switch to the Autolite because they seem to last a little longer in my junk. They do have a harder electrode and don't erode as fast. Electrode is black though, and cut back, which makes reading the timing a little harder than the NGK. There isn't enough money on this planet to force me to put champion in ANYTHING I own, even my weed whackers and lawn mower. They all have NGK or ND in them now.....Bosch also makes a good plug but not common and harder to find. I understand Brisk plugs are very good but they also come with a substantial price tag. Since there isn't really any performance difference, I see no reason to pay $12+ each for a plug if I'm not getting anything more from it.....
Paul