To cycle or not to cycle

Fransje has been too busy lately and cannot accompany me to the gym in the morning. Tat's why I can go earlier and cycle longer on the stationary bike. The pace on such a trainer is higher than when I cycle outside on my own bike. I wonder if the effort can be compared to a normal bicycle ride. I do add the kilometres cycled to my annual total, although it feels a bit like cheating. As can be seen in the graph at the bottom right, I have made it harder for myself :).