As mentioned elsewhere in the thread, the cars will be "fixed" via a recall of some sort, which will likely reprogram the ECU to reduce emissions, which will in

As mentioned elsewhere in the thread, the cars will be "fixed" via a recall of some sort, which will likely reprogram the ECU to reduce emissions, which will in turn reduce performance and gas mileage. Now that might be voluntary - I don't know if laws will compel people to do that, though emission testing might start requiring such updates. Plus, the new cars released will not be able to "have great gas mileage, performance AND low emissions" without technology advances since the cheating is caught and disallowed going forward. So they might be less competitive, initially (though in the US, there isn't really much diesel competition.)