Haha oh it sure does consume gas like an aircraft!! I've never averaged better than 16MPG. These days it averages 14MPG thanks to the cold weather starts. I have to admit, I almost always drive it like I stole it (gotta get the fun out of that V8) so I'm not trying to get good fuel consumption figures out of it.

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1999 Mercedes-Benz S600, 103K miles - garage queen
1988 Mercedes-Benz 560SEL, 89K miles - daily driver
2007 Hyundai Sonata Limited, 31K - daily driver