Heya DM,
So after having already ordered a NOVA 1.1, and reading through literally 90 pages of NOVA system posts on rcgroups, here is what I learned-
1) People still report the mah bug (which manifests itself as an incorrect reading on mah used as shown on the OSD) with the 1.1 version firmware which was supposed to fix the bug.
2) There is a workaround, although its a little tricky. (Workaround below after my attempt at explaining it) It basically revolves around the NOVA system's power sensor calibration when powering on the system. When you plug in the battery to your model and the NOVA, while the ESC fires up and beeps, servos adjust a little, GPS warming up, etc, apparently during that small amount of power usage, the NOVA power sensor calibrates to zero, which is not actually zero as all those little power drains are putting very light load on the system. If you hit the reset button on the NOVA, you would think that it would then reset the power sensor to zero after everything has powered on. However, from tests people have run, it apparently still affects the algorithm used to calculate power over the course of your flight, so you get a variance in total mahs used.
The workaround was to solder a 'secondary' battery connector AFTER the NOVA voltage sensor, plug a 'starter' battery in, and let the system and your model power up. Once everything has stabilized, plug in your main flight battery that passes through the voltage sensor, then unplug the secondary 'starter' battery. Now the power sensor is calibrating to zero after everything has powered up and stabilized.
Check out
this thread, post #1277 to read another, possibly clearer explanation.