Date registered: Jun 2010
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17-18mpg is the rating for K-jet 450's. My older D-jet gets around 12. The w116 300SD was rated for 22mpg, but an SDL will naturally be worse. With careful driving/tuning, you'll still never see above 30mpg in a diesel W116.
The 300SD has a top speed of 103mph, and it pretty good for everyday driving. With a 450 on the other hand you feel like the king of the road - it's heavy and doesn't take off from a stop as fast as many modern cars, but when you're already doing 60-80mph on the highway and put your foot down it jump up to 100 easily - top speed of 130. The gas cost of the D-jets are too frustrating for daily driving but the K-jets are a rather nice compromise, plus it's far easier to find mechanics who understand it.