cmh2007· Beware the Underbite!!!
in mine i run the champion Truck series plugs. cost a little more, but much bigger diode and electrode. supposedly better for towing, and offroad use, and absloutely no pinging with normal gas, but minimal with that 10% ethenol crap. it helps to also clean your sensors on the intake every once in a while or replace them. that will make a difference in mileage as it gets them running more efficently. and finally listen to RAMMAN as he know what he is talking about