Originally Posted by Cobb Tuning
Log looks fine except for the underboost. You can download the high wastegate (HWG) version of the map from the maps section at cobbtuning.com. Use the AccessPORT Manager software to transfer the downloaded map from your computer to the AccessPORT and reflash it to the car.
Mileage should not be notably impacted by these maps, but you will have more power across most of the RPM range, so if you take advantage of that to accelerate faster than you would before, mileage could decrease a little.
Yes my tire preassure light went on so i guess that was the cause of the mpg drop, as for underboosting it is now reaching 16psi which i think is acceptable due to the high temperatures and humidity.