Finally found it in the manual last night. It is .040 for the iridiums. Drove today about 300 miles and the check engine light came back on. I didn't get one of the wires back on good enough.
Still had 17.3 mpg, hopefully much better now.
So which cylinders turn off or is it actually that the valves are opened and the fuel turned off. 4 of the plug were oily, maybe this is why I loose oil between change and exhaust pipe is black.