Some times if there is a large car count or several classes, I'll enter two classes just to stay busy. If I'm not busy, I tend to get bored. When I get bored, sometimes I get complacent and when that happens, there's no telling what I might do (or not do). Nothing good ever comes from that.
And I fill the fuel tank after every pass, until I get to the semi finals, then all my focus goes into getting the driver mentally prepared.
Brian Dunnigan