azhari,

feel your frustration.

this board always provides laughs when you need them most!!

try spark plugs

ignition wire /end cap faulty

rotor

distributor cap

leaky injector.

look at your fuel injection component connectors ?loose

you could also look at the fault finding section in the haynes manual for 190e cars-usually they give you list of causes/possible repairs for execessive fuel consumption.

hope this helps.