It looks to me like IBM have been able to patent simple mathematical division!

Utilizing gross vehicle weight to determine passenger numbers

A method, system, and computer program for determining the number of passengers riding on a vehicle in real time is presented. A total weight of passengers on the vehicle is divided by an estimated weight of each of the passengers to estimate how many passengers are on the vehicle in real time.

I’ll have to get my patent application on utilizing fuel tank capacity to calculate vehicle range filed before anyone else does.