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I'll add some new info....I went cheapo and tried midgrade in my 300E, and well well well, it runs perfectly fine/the same on it. I got 22mpg going 74mph for 250 miles with the A/C on full blast and the car full of camping equipment last week. I won't use regular, but since Midgrade works, that's what I'll be using....engine runs/sounds/feels/performs exactly the same as on premium....in fact, I think it idles a bit better and starts a little easier. I still use the redline in it to keep it clean though.
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-diesel is not just a fuel, its a way of life- 
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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