And here I was feeling good I did 865kJ in one hour yesterday going really hard (89% of 269W FTP. Was shooting for an even 90%). But I'm 45 and I've only been going hard on the bike for 2.5 months (as opposed to kinda sorta hard before) so I'll pretend that's a good number.
Assuming the calorie conversion from my power output is reasonably correct, I've burned 35,500 calories biking in the last 2.5 months, or a touch over 10 pounds. I've also lost 10 pounds. Which I guess means near 100% of my weight loss is from exercise and little from changing my terrible diet. (A little is from lowered consumption as I'd gain about 1/3-1/2 pound a month if I had minimal exercise so that's about 40-60 calories a day).
I keep getting told that such a thing just isn't possible.