(1) How does one interpret a data log to figure out if their LTFT can be improved and (2) how do you know if you have quality data? I have 3 logs of steady state cruising that are over 30 minutes long. While reviewing my data I noticed that my cruise LTFT jumped from 3.32 to 5.85. I've read that you shouldn't be concerned with anything under +/- 5 but my LTFT doubled. Should I be concerned or was it something I did while driving?