Enduro 2 - All Systems + Multi Band Battery Estimate

Anyone else noticed the battery estimate when using the multi band dual frequency satellite setting is showing far less hours than the spec sheets for the Enduro 2 state? 

According the Garmin spec and all the marketing content, this mode should yield up to 68hrs, however the estimate showing on the device when at 100% is only 45hrs.

If you play around with power managed you can get that to a max of 47 but that’s still a long way off 68. Interestingly all other satellite mode estimates match up to the Garmin spec sheet when the watch is at 100%. 

Thoughts?