Code 81 and 82 you can ignore. You can put some resistors in the plugs if it bothers you and you'll never see the codes again. Leaving them doesn't change anything how the car runs. Excellent, not worried about those codes. Probably not worth the effort to do anything.
Code 85. You can also ignore. I assume the gas cap is vented anyway. Yes, not worried about it.
Code 79 is AC/Defrost was on during the testing Agree
Code 33 does turn the EGR function off. Is this system functional on your car? Most folks delete it? The code 33 turns the function off, so short of an EGR leak into the engine, this shouldn't affect how car runs. It was working as far as we know, but have not looked at it in detail. The code is new since yesterday.
Long story short, codes indicate the ECU/engine is running properly. How does it feel?
Thomas it ran fine in the short drive to school. Thought it sounded different. He'll drive it more this afternoon. I think he should drive it for a tank of gas and check the milage again. I'm searching eBay for proper upper intake as the next project.