Get into that weirdo forum before the police get you......

40 miles per week probably burns less than a third of a pound in fat (1200-1300 calories)

You lost 20 pounds. You basal metabolic rate is lower. You are in equilabilrim. You either now need to eat less and/or ride more to loss more weight. The other factor improved efficiency riding. As we get fit, we become more efficient.

Cut 100 cals per day and add that 40 miles per week. You will burn another half pound of fat per week.