I've got a 2017 Platinum EL 2wd with about 112k miles on it. I don't tow and it is stock (but I do get on it when I drive it). Misfire started on #1 today. I want to replace the plugs, but I'm seeing the replacement NGK part number is 90495 (LTR6BHX), but you are recommending 95605 (LTR7BHX) which is a heat range colder. Is the plug you are recommending so much better than the Ford plug because it is an NGK, colder heat range, or both? Which is the preferred part number?