Proper tire inflation pressure information is found _______________.

Proper tire inflation pressure information is crucial for vehicle safety, fuel efficiency, and tire longevity. This information can typically be found in multiple locations to ensure accessibility for the vehicle owner or operator. The driver's door or door post is a common location where manufacturers affix a label detailing the recommended tire pressure for both front and rear tires. This label often includes additional information such as tire size and load capacity.

Additionally, the owner's manual is another excellent resource for tire inflation information. It contains comprehensive details about the vehicle's specifications, including recommended tire pressures under various operating conditions. This ensures that the driver can refer to the manual if needed.

While the sidewall of a tire does display important information, such as the maximum tire pressure (not the recommended pressure), it’s not the primary reference for what is considered optimal for that specific vehicle. Therefore, the combination of the information found on the driver's door or post and in the owner's manual makes both those locations the correct answers.