Was temperature a factor?
In mild fall weather, my highest charge shows ~114 mi on the GOM. In the winter I'm lucky to see 101. Typical remaining at charge is 50-75% due to my daily commute.
I do notice that charging speed also seems to affect the GOM reading. Slower, OEM granny cable charge at 10 Amps yiedls 120 mi on the GOM in decent weather. My aftermarket granny cable rated at 16 Amps yields between 96 and 115 mi depending on temperature. It's hard to know what factors the GOM uses and how it weighs them.