Do mountain bikes burn more calories than city bikes?

Mountain biking… That is, off-road cycling on difficult terrain, is very demanding physically. The whole body is involved to a larger degree than in road cycling as one must use considerable upper-body strength, ride out of the saddle more, do jumps over obstacles, etc. But riding hard on the road can be extremely taxing as well, especially if there are hills. “If you want to go fast and far, get a ebike”.