Do NOT listen to that dipshit that said to fill up your tires to what it says on the tire. The number on the tire is the MAX PRESSURE that the tire can handle. ALWAYS fill up your tires to manufacturer specifications.
I build big trucks for a living. Even when you build a lifted truck with 40s the tire pressure is still the manufacturer specifications. What you probably dont realize is even though your car is probably 35psi, big 2500/3500 trucks the manufacturer specification is 60psi front and 70psi rear. The size of the tire doesn't change the tire pressure.