This is one place where
bsfc charts come in handy, they tell you the most efficient operating parameters for your engine. Arag, I would think 4000 is a little high, dunno.
To extract the most power from a given amount of fuel in this example (02 TDI), I want to center my shifts on 1750rpm and have the throttle wide open.
On my saturn I want to center the shifts at about 2500rpm and maintain about 70% throttle.
From the field folks seem to do well with a slightly less aggressive acceleration profile, and of course stop accelerating early to avoid mashing the brakes.