well, 124 miles over 21 days by bike is, not a ton either honestly.
1lb is 3500 calories.
6'2", 260lbs, 30ish?, 6 miles/day, at 6min/mile ~120cal/day. x21=2520 calories. less then 1lb lost.
Walking 6m, at 20min/mile-330 calories. 6920cal, 2lbs lost.
Start logging in time and distance.