If you do this from cold you will get a reading lower than the actual amount. Cold oil is thicker and starting the engine will lift the oil to the top end and it won't return to the sump in any quick fashion.
For me it's either cold engine as long as the engine was running for at least 10 mins before it cooled. Or 5 mins after turning off a warm engine.
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Oil level will rise slightly with a hot engine. Check at operating temperature with the engine standing 5-10 mins after running.
Manufactures generally state that you could burn up to 1 litre of oil per 1000km (620 miles).
I've just been to Germany and back, 9 laps hammering around the Nordschleife, overall over 1000 miles and used very little oil, if any.