Agreed! I ran my '07 up to 105000 miles with three dpf plugs, the last one being out of warranty. So it was at 105k that I did mine. I'm at 160 k today, and I tend to blow some smoke now and again, but it's still rollin along at around 19.5 avg mpg.
I'll bog sometime at low speeds, like crawling through traffic backups, but I finally figured out to just shift the 6-speed automatic myself, and I can keep the r's up enough to blow out any buildup and power through any congestion.