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So are Garmin and Wahoo. 2 x the wrongness.
RWGPS I think picks the closest point to your route that it has elevation data for. So it's always going to be an estimate and that estimate varies depending on your route and which maps you use. You can see it change by grabbing a GPX importing it and then doing an Auto-Trace of that route. More points = more accurate estimate.
hippy-
I've tended to use an applet which takes the gps tracklog, samples it and then runs this through the high resolution DEM from the OS. This tends to give a more accurate result than the models used on strava / rwgps which tend to use global datasets.
This is the approach used by AUK for AAA calcs.
The Moscow Express ride ended up being 2,400 m vs 1,900 m
motoko
RWGPS is always wrong