The 2008 Mercedes-Benz 550 is the “entry” into the S-Class lineup and has a base price of $87,575. It comes equipped with the 5.5-liter, 382-horsepower V-8 engine that delivers a 0-to-60-mph time of 5.4 seconds. However, with these excellent performance specs, as you may imagine, the S550 consumes enough gasoline to have a $1,300 Gas Guzzler Tax slapped on it. EPA estimates city/highway fuel consumption to be 14/20 mpg.