Log RPM during your run, and then view it later to see if changes you made helped and find problems like wheel spin and top-end fuel or ignition issues.
The app also tries to determine when you shift, and then summarizes several statistics for each gear. When are you ACTUALLY shifting? How long is it taking to shift? Below is a sample log, this is what it looks like when you view a saved log. Notice the wheelspin at about 3 seconds?
