5.3gpm spitting out more than 6gpm... How

I got a 5 gallon bucket and turned my pressure washer on to see if it is actually filling up 5 gallons a min. I set the timer and the bucket was overflowing before 50 seconds. I’m not complaining about the extra power but is there something that I am doing to have it overwork like that?

Most any pump will do that. Put a pressure tip in rated for your max psi advertised on the pump and see what your gpm is. That’s a true bucket test

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Also if you have an injector in-line it will also add to the total volume

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Thank you. Ill test it this evening