Mobile data in the car. Good idea, but how much data should go into a Connected Car plan? We say around 50GB! (if its FREE) and maybe 5GB if it's priced at standard data rates, costing around US$15/5GB (that's €14 and £10). Has anyone done that? Yep, Audi and AT&T have got some plans worked out, and many more rolling out similar plans. What's your take, anyway?