Attached is a photo of how my plugs wear.  At less than 10 hours, the engine idles rough.  These went almost 18 hours (mostly cruise) and the majority of that was on 100LL.  Sorry it is a little fuzzy, but you can see the erosion of the center electrode.

 

Any recommendations for something that will last a bit longer?  I use NGK BUR7EQ and BUR9EQ plugs.

 

Bill Eslick

 

"Award Winning RV-6R"

    Sun N Fun 2003

 

Sorry, but I just HAD to do that!