Those with cars that get 8 mpg don’t drive them.
They leave them in the garage and polish them once in a while, and maybe take them out on really nice days for a spin.
Yes, our W350 Dodge Crew cab 4x4 gets 10 and sits in the garage unless we need to buck snowdrifts. Meanwhile the LT1 Trans Am gets 24MPG we drive it as much as possible, it is not a garage queen. I work with a guy that has a late 2000 corvette that averages in the high 20s no matter how he drives it. He’s driven it in snow!