I really think gearing depends on engine design, tire size, track type and conditions. I gear for the longest straight on the track.
If I have a 400 yard straight, I don't want to run out of gear in 200 yards and if my longest straight is 200 yards, I don't want to be just clicking into 3rd at the end.
Each one of these examples I'm giving something away to the competiters and that is what I don't want to do.
CCD Howell: you are right, If you have a bottom to mid range motor, then gear it to work in that range, don't gear it to scream around the track if the engine isn't desiged for that. If you gear it to scream around the track, then your giving away the torgue and HP at which the engine is designed.
It is just like gearing a 2 stroke only a 4 stroke is more forgiving, 2 stroke you must keep it on the pipe, and that is where they make power.