BS
Sorry, but I do. It has a lot to do with powerband and gearing, as well as the vehicle’s fuel map. At 2200rpm, the fuel map just sucks because the air metering device isn’t really all that accurate. At 3000rpm, it’s much better and more efficient.
You do realize that the *most* efficient mode of use for a piston engine, in terms of power per fuel unit consumed, is wide-open-throttle, right?