Thank you 2late4u?
I have removed all the seats and carpets and found that the left, rear passenger side also is soaked with diesel?
The right hand side is dry and fine, i did search for fuellines inside the car but did not find any.
I noticed a small leak under the car, i will raise the car and check it more thorougly later today but i dont believe that it would cause a diesel leak into the car.
I start to suspect that a previous owner at some point may have spilled fuel inside, thats the only explanation i can think of.
Anyway, i will clean everything really good and put the seats back and drive it without the carpet, if it still has diesel coming into the car i should notice it.
If everything is fine, i need to find a carpet, preferably a used one...
About the fuelmileage, i really dont know as its my daugters car and i havent been driving it much.
Thanks
Jannelu