Thread:RR3G'hamO./@comment-27048832-20160119165003/@comment-26715739-20160119171257

I thought it was based on number of races per manufacturer - but maybe I'm letting that be influenced by the fact it appears on the same screen as "favourite car".

Maybe it is based on which manufacturer you have the most cars from (which would be consistent with your recent change)? Another alternative would be the manufacturer with the highest value in your garage.

It would also mean that most people should have Porsche - since it has the most cars.