Forget the gauge, log/view your short term fuel trims and AFR/lambda in real time
Normally would want the AFR/LAMBDA to be in the .9's in a NA car at wide open throttle
If your short term trims are going well into the 1.1x or 1.2x range you might be having trouble keeping up with the extra...
They would sell an extra 5,000 in one week if they unlocked the computer
It's not just young people that want to tune the cars. So many people kept their highly modified S550's because they can't do the same to the current model
Please don't compare to the Corvette its a an amazing machine...
1. Most dealers only do oil changes etc on the weekends
2. Loaner car is not standard
3. Normally you would make an appointment for service, assuming your car still runs/drives
If they find out you did OPG they could void your stage 1 warranty. Go stage 2, the tune is much better.
Also the first thing I would be worried about is the transmission and they only cover $2,000 towards that repair