I dunno, the progression and arpeggios in the toyota commercial are pretty different in the end. It's true that it share a similar "theme" loosely and I could see someone having drawn inspiration from your pieces but in they end they are too dissimilar to have any chance of creating a court case out of it...
Dachampster
It sounds similar, however creating original music is tough. SOmewhere out there is bound to be another melody that sounds like this one as well.
In short, you're going paranoid