Software version 15.10 still poor on treadmill distance

Treadmill distance estimation even worse since the update. 
Distance run 3.11 miles distance recorded 4.83 miles. 
That’s  over 50% out on accuracy. 
This is unacceptable from Garmin that they take a product which worked fairly well then updates it to work badly then updates Again to be worse!  
Garmin need to sort this out or not offer it as an option.