I was at the dealership and just asked about spark plugs because ive been procrastinating changing them and he said the new ones gm recommends are the delco iradiums gaped a .040, this seems normal but under the hood it says .060, he had the right year truck and everything and even at parts stores it says .060, i dont doubt that they changed it to .040 but im just wondereing why, to take care of pinging or spark knock maybe?