28's not bad. I see around 28-30 from my '80 300SD even with a VERY heavy right foot. By the way, if you think your engine is up to it, find a nice, straightaway on the interstate and mash it, wind that tach around to 4,800rpm and feel how wonderful a W-116 is at 110mph--and man, the growl of that engine....
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Rgds,
Aaron Greenberg
MB technician
Precision Motorcars, Cincinnati, Ohio
'67 250SE Cabriolet
'77 450SL
'80 300SD
'85 380SE
'89 420SEL
'93 300E 2.8
'72 Alfa Romeo 2000GTV
'74 Jensen Interceptor Mk.III
'81 DeLorean DMC12