I've looked at some of the responsive frameworks, and they seem to come with a lot of baggage. I'm definitely in the less-is-more camp, and so I hesitate to add additional software dependencies to the site. I'm still looking around, though.
Was gonna suggest there are some responsive design css templates you can probably find one close enough to modify for this site style. But again that's probably a decent amount of work onto your plate and i think it's not necessary.
Btw, im one of those fuelly signature users, but i chose to use the condensed version for that reason.