Without nit-picking about the exact number of REAL Calorie burn, I'd say that anything between 2000 and 4000 Calories is believable. The real question was the weight gain. Fat is about 3500 Calories per pound; and gaining 2 lbs of muscle overnight would be a miracle; so in order to gain 2 pounds of fat, bruce19 would have had to eat 7000 Calories over and above what he'd burned on the ride. A 9000-11000-Calorie-eating day? I don't think so. The only possible explanation is the difference in hydration. Eating salt or carbs (they're not called carboHYDRATES for nothing) would explain the weight gain, which would be temporary. A lot of diet plans will tell you to not weigh every day; because normal fluctuations like that will drive you crazy. Weigh a couple of times per week and watch the trends.