Should have maximum tire pressure on the side of the tire. You can play with the pressure to suit your needs. In the owners manual of my other Kymco's it gives the pressure recommend for solo or double riders, about 4 pounds difference. I weigh around 230 and run recomended pressure for a smooth ride. Keep in mind too much pressure and the contact patch of rubber on the road will decrease. I never bought my scooters for speed or fuel mileage but for entertainment. I'm retired so just not in that big of hurry to get somewhere.