2ml a day was great couple of years ago when coils weren't as big as nowadays aka juice guzzlers, going through 15-20ml a day I would say is normal but 2ml I assume u forgot to add the 0 next to the 2 lol
For me it's also hard to say how much i use every day since i'm using 4-6 setups.
When i was vaping MTL only i ran through 3-5ml i think....now, with MTL and DTL i'm about 10-15ml.
I average between 20-30 ml a day depending on if I'm in work or not !!! When I'm on Holiday is a different matter all together, I went through 300ml in a week in Lanzarote the other week, But I think the alcohol intake and late nights had a lot to do with it !!!