True, but I do not think wind resistance is 100% or your full consumption. But even if it were, then you would you 90% more fuel per hour. But in on case travel more than 30% further. But if I were to guess (at least from my car, but I will check it in the future) it is more like 6,2l/100km at 100km/h and 7l/100km at 130km/h.