I think they got fined for exaggerating their EPA mileage. Fudging test results is not the same as tuning to the test rather than real world driving, the test does not involve a real world speed. Optimizing the car for mileage at the test speed would not be illegal, as long as you don't make any false claims about other speeds. But I believe the law prohibits auto makers from advertising mileage claims about anything but the EPA tests.Grandpa's Spells wrote:This hasn't been the case for a while. Hyundai was 1 or 2 MPG generous on their assessment, the EPA said it didn't match up with real-world driving, and Hyundai paid a fine and had to repay owners the difference in the amount they spent on gas.ccrow wrote: For decades car makers have gamed the mileage tests in a less blatant way. Cars are designed / tuned for good mileage on the EPA tests, which are the only mileage stats you can put in an ad, often at the expense of real world mileage. In reality nobody drives 55 mph like the test, so real mileage doesn't match up with EPA mileage.
I imagine that with modern electronic controls that sweet-spot effect may be reduced but I doubt it's been eliminated. It's not strictly software.
BTW, Hyundai and Kia have also been fined for misrepresenting emissions.