"it would seem that VWAG was unfairly singled out" If you look at the true numbers, yes. But VW has been targeted for intentionally cheating. And don't forget,

"it would seem that VWAG was unfairly singled out" If you look at the true numbers, yes. But VW has been targeted for intentionally cheating. And don't forget, some Audi engines are also inherited from VW.