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Yeah lower rpms means the engine is running each of the steps less often. At a set throttle opening the engine injects x fuel. If its rotating faster its injecting a tiny fraction less fuel per cycle(its getting slight less air per intake, but rotating much faster) but the number of cycles far outweighs the decrease in airflow.
In short if you can stay at low rpm its always better unless you are running it WOT to maintain that. So as long as you can barely depress the gas and still maintain low rpm thats the goal.
A vacuum gauge helps you measure because more vacuum you can get the less fuel you use.
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