Recently (begin of May ... yes in some part of Switzerland we're getting some snow up to the end of April :-( ), I mounted the standard 21" turbine wheel on my P90D Ludicrous. During the winter, I drove the car with the factory 19". 19" wheels are equiped with the Nokian Hakkapellitta R2; 21" are equiped with the Michelin Pilot Sport. I did some energy consumption measures during the whole winter, and for the trip, driving +/- the same / no climatisation / eco mode / ext. temperature about 10-15C with 21" v.s. 0-3C with 19", the energy consumption is about 19% higher with the 21" wheels. On the Tesla website, the difference is 5% in the same conditions. Could someone explain me what could be the problem?