"Real world tests" not matching the results of the mandated emissions testing isn't the same thing as what VW did: they made the cars secretly act differently during the tests in order to pass them. The other manufacturers' cars pass the tests without skulduggery, but still have different performance in the wild.
VW's cars didn't have the same emissions when on the same test rig with and without the diagnostics port in use.
As I recall, there is a new test that more closely matches real world performance (in aggregate, not any one individual, supposedly). The problem right now, of course, is that the current test is so wildly unlike anything you would see in the real world as to be essentially useless, particularly when it is also used to set emissions policy against pollution targets.
VW's cars didn't have the same emissions when on the same test rig with and without the diagnostics port in use.
As I recall, there is a new test that more closely matches real world performance (in aggregate, not any one individual, supposedly). The problem right now, of course, is that the current test is so wildly unlike anything you would see in the real world as to be essentially useless, particularly when it is also used to set emissions policy against pollution targets.