Is this news? Because I've always assumed the tests are very biased. my car says it can get 70mpg in extra urban, yet it gets 54 max, I knew 70 was a lie when I

Is this news? Because I've always assumed the tests are very biased. my car says it can get 70mpg in extra urban, yet it gets 54 max, I knew 70 was a lie when I bought it. Same with the tv, light bulbs, fridge and so on. In no way is any of it real world efficiency.