Truffade is based on Bugatti. The Truffade logo also resembles the Bugatti emblem. Truffade has been making cars since the 20th century, since the Z-Type seems to be one of their older models. Truffade is probably owned by Vulcar , since Bugatti is owned by Volkswagen in real life.
A truffade is a dish popular in France, where Bugatti is headquartered.
Truffade makes the most expensive cars in the GTA Universe, and in fact makes the fastest since the Z-Type is claimed to have been the fastest car in its time, and that the Adder is the fastest car in the game.
Truffade is most likely owned by the BF group as Bugatti is owned by VW in real life.