Must be nice to have those long stretches of constant speed to test on. FYI; I have been looking at the GOM verses LEAF Spy and found some interesting "issues." *commenting on post in T3 thread*
On my relatively short commutes 27.9 or 28.0 RT for work, I was seeing what appears to be the GOM not rounding up.
I was participating in a trial at Fred Hutch, so tracked that and got a completely different reading over 126.3 miles
Haven't looked into why this happened but some data points; My commute is generally 60-70 in the morning, 65-75 in the evening 2/3rds freeway. It is a constant up and down. My higher speeds are simply playing the gravity game (BTW...it seems to be the rule of law in this area of I-5) so guessing the Seattle trip numbers have to do with what is likely a MUCH larger regen figure. I do check my regen values on my daily commute and see generally 2 miles (one way) with a rare 3. Morning trips see some congestion on 'incident free' days but rarely see any slow down in the evenings.