My last Benz was a butterscotch '79 300D. (Colnel Mustard affectionately) Anyway I remember getting around 30 mpg with that car. My '85 300SD gets almost 24mpg. Is this normal? I drive about 45 miles one way to work and I climb a decent size mountain. I know it will not get as good mileage as the non-turbo but I feel as though I should be near 30. Am I nuts?
the car runs great.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R