On my Golf, to get the overall mileage you need to turn off the acc using the button on the steering wheel. The speed limit is then replaced with an overall mileage figure. I’m guessing the Ateca will be similar?
With acc it’s obviously affected by the car in front. When you’ve got cruise on it keeps you at a constant speed but more often than not you’ll find that the car in front won’t be using cruise so their speed will constantly change. This means you’ll regularly be slowing down and speeding up to keep to the set distance.
When I got my golf, I thought the menu systems were quite complicated as it’s very customisable. I’d like to think you’ll be able to access other types of consumption, average, since refuel, long term etc but just need to figure out the buttons. I’d be surprised if that info wasn’t available. I’ve had my golf for 3 years and i still can’t whizz through all the menus to find what I want.