I'm just starting to tune my 2012 C6. I have tuned my 2007 C6 quite a lot. When I did write calibrate on the 2012, my average fuel economy, range, and average mph on the dic read 99.9, 999, and 70. I can hit reset and it goes right back to zero and then jumps to 99.9 right away. My 2007 never did this. Will it sort itself out, or is there something I need to do?