DDH you're right there with my previous fillup of 327 miles in 11.123 gallons, roughly 95% interstate miles as well. Surprising economy in a LWB 126, but I'm completely happy with it. Good power, no smoke, starts easily, and good economy. I'd say it's pretty well set! No Bosch shop here, but I got REALLY lucky dialing it in on the 2nd try.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)