clearance

I've out of the forum for a while but I've come back briefly. My trusty and crusty 2006 has finally hit the 110,000 mile mark. The only major item done was a timing chain tensioner. No valve clearance checks and I still get about 40-50mpg. Heck, even the clutch is still the original along with...

Hi guys what are the signs that valve clearance needs to be done?