Sprinter bus is the cheapest & quite convenient.
Excellent service; inexpensive... It's gaining popularity. When it started, it was used mainly by UK & German tourists.. Now - they even increased the frequency....(20 minutes during weekdays and every 30 minutes during nights and weekends. )
see the website & download the schedule...
Sprinter= Bus No. 5 - that is the one bud41 refers to...
I think it is still $1.75 though rumor is that it will increase to $2. Still, much better value than $23-25 taxi...or more?
Forget car rental; not cheap in CLT & parking costs can be high...
I would take the sprinter, have a nice breakfast or early lunch & visit Bechtler and/or another museum...(Unless you have another reason for the layover...)
Edited: 10:19 am, February 02, 2012