The Maverick doesn’t use 55w halogen headlamps. The maverick’s LED headlamps are rated for 12 watts each.
The maverick’s seat heaters each use a 10 amp fuse, which means 120 watts max. Engineers typically design for 80% load capacity, which means that each seater will most likely draw 96 watts on the high setting. If they drew less than that, they would use thinner wires and smaller fuses to save on manufacturing costs.
Found the probable answer. Ford seat heaters in their parts catalog draw 90 watts each. That’s a 7.5 amp load and they use a 10 amp fuse. The fuse for the Maverick seat heaters is also 10 amps, making it a safe bet that the Maverick seat heaters are 90 watts.