This is driving me nuts!
 

Last night on the drive home I heard a really nice acoustic song that sampled Tracy Chapman's "Fast Car" at the end. Any ideas?

Hmm. I'd like to try and find it. Just a few questions....
Was the song instrumental, sung by a male vocalist, or a female vocalist? If so, do you know any of the lyrics?
What station did you hear it on?
Any idea what genre the song falls under in general?

If you tell me the name of the song I'll be able to find it easier.

It was a female vocal, it was one of my satellite stations, not sure which. The only lyrics were the "Fast Car" ones at the end.

I was just on a road trip and I was able to hit the info button on my sirius radio fast enough when this came on to get it down this time.

The song is a version of "Breakeven" by Colbie Caillat, which apparently is a "sirius exclusive," whatever that means, since it's not available on iTunes.

^^^
Ah. That makes sense. Glad you found it!