Chevrolet Repair/Tire Pressure
Alston wrote at 2011-12-09 20:28:25
You should always go by the manufacturer recommendations unless you have modified the original rim or tire size. I would guess that the mechanic told you 35 as it was the max rating of the tire and overinflating will improve your gas mileage. The down side is it will cause greater wear at the center of the tires and will decrease traction and therefore overall control of the car, this is especially dangerous in rain or snow. Tire manufacturer air ratings are based on a maximum weight limit of the tire, which your car does not likely weigh.
The exception to this are specialty tires made specifically for better gas mileage. They are usually narrower than factory spec and therefore require higher pressure per square inch as the tire footprint is smaller.
Note that the tire pressure rating is for when the tires are cold. If on a trip and adding air, fill tires to 2 Lb more than recommended if the tires are warm, then when they cool they should be spot on.
dougie wrote at 2014-09-21 16:02:14
The air pressure specs that are listed in ur owners manual and listed on a placard in the drivers door jam are what u need to follow. The tire itself just shows a max allowable pressure for that specific tire, but the vehicle manufacturers have it calculated for specific tire SIZE and PRESSURE (regardless of tire BRAND) to optimize fuel economy, ride comfort, and handling based on that vehicle's weight distribution. Overinflating by even 2psi will cause uneven tire wear and alter the vehicles handling and fuel economy