I don't pay a dime to watch TG. I download bit torrent files of it for free here:
http://www.finalgear.com/shows/topgear/
BTW, this is legal as it's publicly broadcast as far as I know.
They post episodes the second they're finished on Sunday nights. I download them ever Sunday evening and watch them on Mondays.
I really hate the fact that on Comcast they only show really old episodes from last year and are always lagging behind.