I changed the spark plugs in my truck today. I decided to try some E3 plugs I have heard so much about. I had to make two trips to the parts store because they shorted me two plugs, that will teach me to always check the bag.
After I got them installed, I took a little test drive. The truck did perform a little better, had better throttle response. Of course the other plugs were worn out, I will never put Bosch plugs in a Toyota again, they didn’t last even 30k miles.
Only time will tell if they actually make a difference in fuel economy.