How old's your fuel?

Ihave a 9 year old TT Pro-.46 Ijust put it it's fifth airframe (a Saratoga 40). It's a hot little engine and has served me very well. Idid "suck dirt" once in the early days when it was two years oldand scoured the sleeve. I sent it back to TT and they replaced the sleeve and piston (no charge!). It's my favorite 2sengine but has one flaw - the needle valve stalk. After the crash mine never did seal out air. Isolved it somewhat by slipping fuel line over the outside of the stalk. Finally Iput a Perry carb on her. Inow get 14.4K with an 11 x 5 prop.and 15% S&Wfuel.