Here is what it means on the units for the BMW. Numbers don't make sense for ours though.
Avg Ign: Average Ignition Retard. A JB4 calculated value with a range of 0 - 6 that represents the average amount of timing below the maximum possible curve over a short term window. Lower values indicate a higher overall ignition advance while higher values indicate a lower overall ignition curve. This calculation is used by the JB4 for evaluating octane content by both map 5 (auto learning) and map 3 (methanol injection). Values below about 1.5 result in full Map 3 or Map 5 scheduled boost levels.
Values between about 1.5 and 6.0 result in lower and lower boost targets as an added safety feature for these two maps. As a general rule when using meth, race gas, or heavy E85 mixtures look for values below 2.0. When using pump gas expect values of 5 or higher.
Here is where I found it. Look at what Ign1 is. This is where I also noticed that they run higher for the FOL, so I gave it a shot to see what it would do on ours.
http://www.n54tech.com/forums/showthread.php?t=21269