Problem with 55-60MPH in CA on the freeways is that some SOB will ride your bumper flashing his lights and blaring his horn......when the passing lane is empty. I usually just slow down when this happens and figure I'll get shot the bird as the SOB finally decides he isn't going to make me go faster, and goes around. Driving the diesel is a bit different than driving the 560SEC. But it might make me a better driver of the SEC too.
Looking for a long trip in Freesil to check the mileage. PO says 400 plus miles a tank is very doable. Right now 400 miles to a tank is fabulous. 24 in town over 13 (560SEC) or 19(380SE) is very acceptable to me.

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1986 Euro 500SEC "RUF" 9:1CR, "Rose"
1985 Euro 500SEC Cabriolet AMG Widebody
1982 Euro 500SEL "Blue"
2001 Texas Heeler (Aussie/Queensland X) "Sulphie",
2012 Queensland Red Heeler "Squeak"
Best dogs I've ever had.