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 possibly owned by BF, 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.