How do I check my tire pressure on an Audi A5?

I've noticed some loss in gas mileage lately and I'm wondering if it's because my tires are underinflated. Can someone explain how to check the tire pressure on my Audi A5 and what the recommended pressure should be?

To check your tire pressure on an Audi A5, start by finding the recommended pressure for your specific model in the owner's manual or on the inside of the driver's side door. Then, use a tire pressure gauge to remove the valve cap and press it onto the valve stem until the hissing sound stops. The gauge will show the tire pressure in PSI. If it's below the recommended pressure, use an air compressor to inflate the tires.