Concept cars can be a lot of fun, but if one turns out to catch the public's favor makers but never make it into production there's often a lot hand-wringing. While they usually have good (and mostly unknown) reasons for not producing these vehicles, what if you could change history? Which concept car would you save?

The V16 Rolls-Royce Phantom could have made it. Cadillac hasn't yet produced their Sixteen concept, but BMW has been experimenting with V16 power since the Goldfish. Phantom costumers don't care about fuel costs, and a clever cylinder-deactivation system could have made it just as efficient as the V12.

The aristocrats could certainly use that every day. But which concept would you take as your daily driver?

Photo credit: Martin Oeser / AP