How much data does Audi Connect use?

[LusyLu]

Husband is thinking about putting a SIM card in the sim slot for Audi Connect. Not something we have used previously but now he wants to run Audi Connect off the car sim and handle calls via his phone when it's connected to the car (which he says is possible)

How much data does the service use? Does anyone have some real-world usage figures? I have been Googling but it's hard to know what is best, some users are signing up for contracts that give 4GB a month and some sites say you can even get by with a Three Data only SIM that gives you 200mb a month: https://www.tigermobiles.com/blog/three-data-reward-sim/ has anyone used this to confirm it works?