Fuel injection engines normally have turbulent airflow mainfolds -- there is absolutely no point in maintaining laminar flow to suspend the fuel droplets (aka mist) since the fuel is introduced right at the intake valve while it is open.

Carbs, on the other hand, REQUIRE laminar flow as much as possible to get the fuel mix at the cylinder correct -- turbulence or flow direction changes cause the fuel to drop out (it's much heavier) and decrease efficiency considerably.

You won't gain anything by porting and polishing a Benz -- they don't just slap a bunch of pipes on like Detroit did in the 50 and 60s, and Detroit does a decent job these days too.

Cyclone devices in the air horn are simply nonsense, on a par with "magentic fuel enhancers".

Milage on the TE is about 19 around town, 22-24 on the highway, never better. A sedan should run more like 26 on the highway if you drive gently.

Lots of pedal will make a difference....

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!