you only used 10.7 AH or almost the whole pack? So if you used 19 AH, you'd go almost 60 miles?

You have 20AH. If you have a loud enough alarm on those celllogs, you should be able to use around 18 AH or 19 AH if you really want to use the whole pack. Just make sure you can hear the alarm if you do use that much capacity. Or since you have it hooked up to your key switch, make sure you know that it works.

This lifepo4 is crazy. Just last year, I had SLA batteries and could barely go 6 miles.