The Buick Century in comparison is much more quieter and the I have often get about 800 KM (600 miles) on a tank of fuel. It has the 3.1 V6 engine.
I have only had 1 repair up till now (tilt steering lever became stuck and that was fixed very quickly).
The price difference between the Malibu vs. Century is very little but the car is much more refined and roomier.