I only use what is necessary, if it doesn't use oil and has good oil pressure why run something thicker than it needs? You are only wasting gas if you run something thicker than you need.......have you ever tried to pour 20w-50 into your truck when it is 20 degrees outside? Pours like maple syrup....so why would you put that into your truck when it doesn't need it? I can only imagine how long maple syrup takes to circulate in my truck when its cold...
Besides, I work at a Honda dealership where we have been running 5w-20 since 2001. Haven't had a single oil related problem in over 2 years. So before you guys start knocking thinner oil.....when was the last time you guys got 50 mpg out of a tempo? Just something to think about.
The civic hybrid and insight run 0w-20.....how about that?