I pulled my plugs to read for detonation. (there was none) They were rusty color...All i run is 100 octane fuel..........Ray

 

Look good to me.

 

Wierd. I wish I could help you out, but I don't know too much about spark plugs.

 

I am not 100% sure, but I beleive you would have white spots on them if you were running lean.

 

leaded fuel?

 

no unleaded 100 octane. I guess if their not oily or white chalky, they must be o.k. Ray

 

they are fine

 

They look fine. The orange tone is caused by additives that are in premium fuels, in your case its 100 octane. You get that color when you run octane booster or fuel injector cleaner also.

 

that is just MMT deposits...additives in the 100 octane fuel...rust color CAN be coolant in the cylinder, but you would be expierencing other problems as well if that was the case...don't worry. I would change them a little more often than usual though.

 

I don't see any signs of detonation or other issues. The orange color is most likely additives in the fuel. If the orange buildup has any thickness to it (aside from just a dusting of color), you might change them out on a more frequent basis. How many miles are on those?