[ajuc]

I'm doing 20-30 km on free days and 1-10 km on most work days for the last 2 years, but not nearly as fast (my average speed went from 4.5 to 5.1 km/h in that time). Are you sure about the doubling of caloric burn?

Cause I started when I was 130 kg and now I'm 90-100 kg and I measured calories in and how much I walked, and calculated the calories burned/km walked depending on weight and it's basically linear for me (roughly 60 kcal/km at 100 kg). It would be very weird if just 30 kg doubled the caloric burn, maybe the speed makes the difference?

At any rate I agree it's great, it completely changed my life. It's very hard to be frustrated after a 5-hour walk.