I get arround 25 mpg average but, with a conservative driving style and longer than shorter rides. I get arround 30 mpg on "very" long rides (over 100 miles) at average speed of 68 mph (110 Km/h). Of course, the 2000 E320 is powered by V6.
I'm guessing the 4Matic feature on mine eats some fuel too. I'll repost sometime when I have a chance to check it more closely. I found that 1-2 tank fills are not a good indicator due to vehicle incline, pump variances, and foaming (in my diesel).
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