I'd find your engine's BSFC and accelerate to cruising speed as quickly as possible staying in that rpm range. It is important to stay closed loop, though.
Accelerating quickly cuts down on pumping losses by opening the throttle plate. High rpm's create a lot of friction, so it is important to keep engine speed low. Essentially, you are trying to drive with a lot of load.
SVOboy's
website has a section on the topic that covers it well. Accelerate quickly, shift early, cruise slow. Use whatever gear pattern allows you to do so.
- LostCause