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Low rpm which would be the highest gear is best when it comes to light load driving.
Now I say light load...how is load calculated. Most modern cars with a MAF sensor calculate load based off of a couple variables like RPM and mass flow. More air in a cylinder, the higher the load. At higher loads and RPM's as well, since it's a 2D table, the ECU will enrich the fuel ratio to protect the engine from detonation.
So really it's about staying light load that keeps the ECU burning at stoich or lean burn if possible.
When accelerating you have to manage keeping light enough load to prevent enrichment, and also not making too many revolutions of the engine (friction). Also you have to take into account the VE (volumetric efficiency) which is not a constant across the entire rpm band.
A lot of variables...just try to drive in the lowest gear without your car getting pissed off at you...ie lugging.
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