Pain at the pump
It’s no surprise that the CTS-V, with its 6.2L supercharged V8 is a frequent gas-bar patron, with its observed 15 mpg in both city and highway driving. It was a very difficult task to improve those numbers. Even just cruising slowly on the highway, the CTS-V achieved under 20 mpg.
What makes it worse is when you do arrive to a gas station, the CTS-V wants premium fuel, which is just salt in the wounds of your wallet.