.....R.I.P. to GM cars in 2012 Buick Lucerne From its launch in 2006, the Lucerne harkened to the days when droves of buyers sought out that freeway-cushioning ride of a stately General Motors sedan driven by a Buick V-6 with its roots in the 1960s. The Lucerne was a successful bridge from the old Buick to the somewhat less old Buick of today. Still, it retires long after most of its owners. Cadillac DTS/Cadillac STS The DTS is long due for a departure; its mostly seen as a limo/hearse alternative to the Lincoln Town Car. Both it and the STS will give way to a new top-of-the-line Cadillac XTS, due early next year, with GM expected to produce an even more expensive uber-Caddy soon after to tackle the Audi A8, BMW 750Li and Lexus LS460L rather than hauling high schoolers to the prom. Chevrolet HHR Once upon a time Chrysler took a boring small car (the Neon), grafted a body that recalled 1930s-era roadsters on top of it and created the PT Cruiser. Seeing Chrysler's initial success, GM copied Chrysler's play step by step — hiring the PT Cruiser's designer to draw a body meant to evoke the 1930s-era Suburbans and using the chassis of the compact Cobalt sedan. Imitation may be flattery at its most sincere, but GM didn't copy Chrysler's sales; the HHR was big and cheap but thirsty, and like the PT never received enough updates to stay current — although the supercharged SS version ranks as one of the best modern sleepers available.