I have had 3 sets of Venoms and now have a Cobra on the front. The worst front tire mileage I got was 24K. The best was over 27K. I run 42PSI. I have a difficult time understanding why others don't get the same mileage.
I do say that is great, truly so, and I wish I could get the same from my tires, thought I don't.
I think you are at the extreme high end with that mileage.
An awful lot depend upon the many variables, To mention only a few would be: (1) tire pressure, (2) road,tire temperature, (3) tire rubber compound, (4) operating weight, (5) riding style, (6) riding habits, (7) road type, (8 ) road conditions, and lastly:
(9) How far down you are willing to ride the tire before replacing it.
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