Actually, I've never heard from anybody at GM. I intentionally left the Pontaic spearhead badge out of the "logo," instead using the group of red lines that you see today (check the top-left of the screen). The "Bonneville" text is supposed to look similar to the real "Bonneville" text, but I was able to pull this off only because I found a font that looked similar.

I suppose that if somebody from GM ever said something to be, I'd be open to change. However, I don't think that I'm diluting GM'* trademarks, so I see no reason for them to come after me.