This sounds about right. My '87 300E is about 3100rpm at 70, and gets about 20-22. Later E class, both 6 and 8s, used a different injection system instead of the one on our cars. BTW, my '88 Acura Legend coupe 5 spd is about 2800-3000 at 70 in 5th, and my '84 Toyota 5 spd is about 2900 in 5th. I am currently looking for a clean 1992-95 400E/E420 for the better fuel economy (sure!)

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John

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E