65?!? Way too much, IMO. I don't know too many riders who run even the minimum pressure listed on the side of the tire. My squishy bike's tires are rated for 35-60, and I don't think I've had more than 30 psi in there.

Too much pressure means less traction, as a rock-hard tire can't deform around obstacles for grip, and instead bounces off them. It's uncomfortable too. A too-soft tire runs the risk of pinch flats and feels like pedalling in wet cement.

The goal is to find the tire pressure that allows you a comfortable ride with plenty of traction, while not being so low that it causes/contributes to pinch flats. The right pressure varies by tire, bike, weight, and conditions.

I would start with the pressure on the high side, and let air out a little at a time until you find the pressure that works for your bike, your riding style, and the conditions. Carry a pump and don't be afraid to experiment