Yeah, the only way I'm getting into the 10's or below with the SLK is when I head down to Toronto with it & take hwy#7, then I can get into the low 9's, high 8's. But my general putzing around to golf, hockey or running around I'm usually in the low 12's at best.
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That's still darn near 20 US MPG...which for a V8 isn't horrific IMO
Took a look this morning. I'm averaging 18.0L/100km through my first 7,000km of driving. About 13mpg. In line with most of the reviews I've seen.
Fill it when it's empty. Don't look too hard at the math!