Thats an interesting ratio. hmmm...but either way on an 'average' run I will do 20k a ride in 2hr. If I spend more time on double track or groomed trails I can do that in an hour but if I go to single track, hidden in the woods and I personally have never ridden it. I can average as low as 7k depending on steepness and technical ability. (especially when you end up hiking 30% of a trail)