I'm looking for some advice on a general rule of thumb for tipping your towncar driver - what's appropriate tipping for the drive, and is there an amount generally tipped if they help you with your bags, as with a bellhop?
I'm a novice at this - we've always just rented a car at the airport, but I'd like to try out something new this time.

I'm a novice at this - we've always just rented a car at the airport, but I'd like to try out something new this time.
