Just playing around, i measured power consumption with two PSU, first one is "high voltage" tablet charger, i runned it with test load and it is stable up to 2.2A, another PSU was some random huawei tablet charger, spec to 2A.
In general, no suprise that most of times when running real life load for chargers, they don't deliver what spec says.
If you are intrested for more data, i can log while printing, or something?