Not to belabor the obvious, but here are the April new car registrations for GM makes in the L.A. area. Keep in mind that there are more than 7 million vehicles registered in Los Angeles County.
Pontiac - 65
Buick - 41
Chevrolet - 615
GMC - 154
Saturn - 96
Saab = 16
Hummer - 9
By the way, Porsche had 190 new car registrations in April. When more Porsches are sold than Buicks and Pontiacs combined, well, you can see the problem.