I did an indoor turbo ride last night and everything was fine. Ran 6km today, mostly in zones 4 and 5 (the heart rate is reading fine, and Strava described it as a Tough Relative Effort), but my 735xt is showing only 79 calories burned with a TE of 1.0. As all the data looks reasonable, I think the algorithm for calculating these is incorrect. I've seen a few people have had this issue before. Was any solution ever found for this?