I think 27 is very doable in an S320.
In my 1993 E320, I got 26 mpg going to Las Vegas, with the cruise control pegged at 80 mph.
S320's have the 5 speed auto, and the 5th gear is a higher gear than the E320's 4th gear.
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Paul S.
2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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