I Have tried them all and the best burning plug i have ever seen is the Bosch [Platinum.] Everytime i have gotten the urge to change them out and replace them,i look and say "Dam,that plug looks perfect."What a waist to replace.
Those darn Champions run great,yeah...for about 500miles.Then they burn themselves out.They are good for racing cause they get replaced at every heat.Not so for everyday driving.Sorry,they are not my preferance. A/C's are just fine,but not great.Actually, Motorcraft makes a good burning plug.Yet over all,the Bosch is tops in my book.The single prong platinum is all i ever have used.Now i see they come out with 2 and 4 prong.i think that is all B.S..But then again,i have noy tried them.They do not seem to foul out at all,so i don't see the need for the fancy crap....IMO