Starting next month, all new cars sold in Europe must have "something" that alerts the driver when they are over the speedlimit. The manufacturer can choose from a visual alert, a sound alert etc, or even that you cant go faster (seems dangerous).
I guess manufacturers will allow you to choose...
What usually happens is when the previous person brought the car back, it was topped up maybe 10 miles from the dealership ... the gauge will still show "full" when they arrive. Or they only drove it for 10 miles and got away with it. Then you get the car, drive it for 10 miles and think...