That explains it. Once you start pedaling more, you'll see a big jump in the number of miles you can travel per AH. Per the logs I keep with my CellLog 8, I'm getting anywhere from 4.58-5.89 miles per AH on my TS LIFEPO4 pack, but I'm pedaling all the time (and often grateful for the granny gears on my bike when trying to climb the steeper hills here).