Hi George, I completely agree with you and was just looking, if there is a class action suit out already. I have the exact same case and I have no doubt that the milage posted for the car is false. Reason for this is, that I am driving two cars in the same location, same weather and same driving style. While the CTS doesn't come close to its claimed gas milage, the other has always been reasonably on track. I have tested both against one another, city and highway, resetting the board computer just before the test, with matching average speed posted on their computers.
The 2013 CTS should get 18 city, 26 highway and 21mpg average. I get 12 city, 21 highway and 16 average.
The 2007 XC90 Volvo should get 15 city, 21 highway and 16mpg average. I get 12 city, 21-22 highway and 16-17 average.
If the testing method the EPA uses hasn't changed between 2006 and now, both cars should vary similarly from their EPS's estimates, if driven and treated in the same way. But this is definitely not the case with my cars. I had Cadillac check the car after it had plenty of time to be driven in. They found nothing wrong with it and send me home with a printout explaining what could cause the differences.
This would have been sufficient, if I didn't know that none of the reasons mentioned on the printout, caused my Volvo to underperform.
Not that it matters in this comparison, but the Volvo also has 50 more horse power, is a V8 versus the V6 CTS, almost 6 years older and a very heavy SUV versus a station wagon.
If anybody knows about any action in this case, please let me know.
Thank you.