While switching to the E3 did increase the gas milage of my truck by 1-2 mpg per the bully dog before i bought it from my roomate. He added some fuel system cleaner to the tank and it fouled the out of the plugs. Cause it to throw a multiple random miss fire code that felt like a coil pack going out. It took me a hot minute to figure it out. Another downside to the E3 is that you cannot gap them. You will get optimum power out of a correctly gaped iridium and then you can even squeeze a few more out of it if you index your plugs.
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