I have driven several different cars in my lifetime and am familiar with smaller cars that hydroplane. Even trucks with nothing in the flatbed that the rear wheels easily hydroplane. My last car was a Murano and it never hydroplaned unless it was a serious downpour and I was going fast on the highway. But recently when traveling from Chicago to DC and back - it rained moderately and our GLC was hydroplaning at around 65mph. I was shocked. It did it several times. I am not familiar with Pirelli Run Flat tires - but is this typical expectation? I know the Murano was a heavy car but I still would not expect this. Thoughts?