Watching 24 tonight the thought occurred to me that Ford asked/payed for Steven Saunders (the bad guy) to be driving with his entourage in Chevy trucks rather than the Ford trucks all the good guys drive.
Ford has been a marquee sponsor for all three seasons and has even gone as far as to present the opening of season 2 and 3 commercial free following a cinematic spot. Their product placement is hard to miss (as are the other products for that matter) but the Chevy emblems seemed too obvious not to be placed.