briscobully wrote:1. Can you not rely on the the remaining kWh displayed on LeafSpy?
Depends on exactly what you mean by "rely" or "trust". No measurement is completely accurate, there is always a margin of error. It is prudent to understand the error budget if you are going to be cutting it close.
The GOM is the worse, for sure. Not only the car's estimate of battery capacity, but also the slightly nutty way the car takes recent efficiency and turns this into a range estimate. I've seen single digit GOM readings at the top of a climb, then driven 35 miles and still had 20 miles left.
https://www.google.com/maps/dir/Dungene ... !3e0?hl=en
A full L2 charge from LBW with the battery at 20C and measuring the total kWhs used is probably the closest to a gold standard battery capacity test that we could do without expensive equipment.
% charge remaining is reasonably accurate, unless you are doing a lot of high power acceleration/regeneration.
The car's km/kWh or miles per kWh is somewhat less accurate, but better than the GOM.
A test such SageBrush suggested is probably more accurate than LeafSpy. I've seen LeafSpy's kWh more than 10% high, and 2% low, based on a capacity determined by a recharge test. Still rather better than the GOM.