Strava registers lower distance than TomTom MySports
i am using a Runner 3 watch and overall my experience is very good. However, I use Strava as my main app and lately I notice that Strava often lists a lower distance than TomTom, greatly affecting my pace in a negative way. I know that each app may use its one algorithm to calculate distance, but I find it remarkable that Strava tends to decrease the distance at run races. I am basing my statements mainly on short twisty trail tracks with several laps.
Example today: Tomtom (9.2 km), strava (8.9 km) - 8 laps trail race
Example last weeks: Tomtom (8,97 km), strava (8.6 km) - 6 laps trail race
I think that differences of 3.2% are quite big. Do you have similar experiences with Strava?
I used to have previous models of the multisports where the deviations were not as big with strava. Do others have similar experiences and is there something I could do about it? I also tried to manually upload tcx / gpx files to strava, but the distance stays the same.