Dear friends, I am tired of looking for the egg-legging woolen milk sow among the cars and equip myself with the features that I lack myself. Rearview camera, PDC, middle armrest etc. It is important to me to have a consumption indicator (current consumption and average consumption) in the car. That just wants to have my hypermiler subconscious. So I came across so-called OBD/2 HUDs. At Amazon, AliExpress and co. there are many that are offered. As far as I understand, the qua i live read-out tools, which I plug into the OBD plug, place me somewhere on the dashboard and can sort of select through the ads. The manufacturers praise that everything from A to Z can be read out: speed speed speed consumption etc. Question #1 I understand the concept so correctly? Further in the text. Now I ask myself if you have to pay attention to compatibilitys. I immediately remember the name OBD or OBD2. Is this all the same? Q #2 Can EVERY car (let’s say from BJ2000) display the consumption via such an OBD2 HUD? Must a special sensor or a preparation be installed for this? I’m just worried that I’m getting such a HUD and then my car is not even able to spit out such information. The said cars would be in the range Hyundai i30cw 2009 KIA Sportage JE 2008 Chevrolet Rezzo 2008 Dear Thanks in advance