What's wrong with GM?

Here is a summary of what is wrong with GM. Take a look at their top-of-line full size sedans. When GM phased out the Park Avenue Ultra, they replaced it with the Lucerne. The Park Avenue was slightly larger than the Lucerne, had more trunk space and more passenger volume but was lighter and got better mileage for better highway range. HELLO GM? THE 1970's CALLED; THEY WANT THEIR GAS MILEAGE BACK.