There's a number on the trike, maybe it is used for fuel limited events in competition. perhaps jozinko knows these guys?
I dont know the guys, but I saw on youtube the video description. There are Russian team over LaManche canal. The trike is Apollo DJ trike with Suzuki engine, made by Air Trikes Enterprises Canada www.airtrikes.net. Maybe Vassili can give us more info. I think it is in liters add tank