I'm 100% certain, Byron's 30-11 does not rapidly wear crank pin like that. That's a fact. Which is why it is the fuel I always reccomend. I see crank pins ast well over 10 gallons using the 30/11 blend. I consider the crank toast when it gets down to the 4.90-4.92 range.

Edit: 4.90-4.92 in the .21 engines. They start @ ~4.99-5.0