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@ewanmac
With the obvious caveats about large pinches of salt.
That website proves very poor at predicting my 10km times from my marathon times and vice versa. I would always have said that my relative advantage lay in longer events, the longer the better but according to this website it's the other way round - my 10k time (just done casually in training) gives me a marathon time 10 minutes faster than my PB.
Interesting tool though, maybe I just need to run a faster marathon.