Dear
Before the two last firmware update I had no issue with the speed average with my eroad bike with FAZUA engine after the upgrade I had a big difference with the speed average with the K2 regarding the Strava data
I sent a mail to the support to told them and explain the issue and the only answer I’ve got receive please disconnect in the sensors the FAZUA engine
I paid 400 euros to have an operational gps I’m a totally disappointed and I’m ready back to Garmin
I’m a customer not satisfied and I’ll write some post in the social network
Try checking them against your phone as a tie breaker.
there have been a lot of discussions about GPS and phone mileage variability.
They use different programs and satellites sampling rates and phones are even more variables
10% variability between devices is not unusual.
I had 5 to 8 % between the Karoo and Map my Ride on a TMO iphone
you are using wobbly yardsticks and besides GLONAS is made by whom? yeah, him.