Ok guys thanks to everyone for the great advice I plan on looking everything over later today if I get a chance and see if I can find any leaks. I haven't seen anything leaking under the hood since I have owned it. I will look better now and check around all the injectors and actually get under the car too if I get a chance.

What I did do is today I was down to 1/4 of a tank driving to town and back. I remember at half a tank I drove to town and back twice and around here close to the house maybe a couple miles just going to the store and to my dad's a couple blocks away.

I drove around 75 miles from half a tank to 1/4 of a tank. So today I was thinking well if there is a big problem with the gauge or the sending unit in the tank if I put fuel in it even if it's just 5 gallons it should raise my gauge a pretty big amount. So I went to the store and I put in 5 gallons of fuel. It raised my gauge from 1/4 to 1/2 so that gave me 1/4 of a tank of fuel. So with that said because I knew the mileage I drove from 1/2 down to 1/4 was 75 miles then that should be enough proof of the mileage I'm getting. That puts me around 15 MPG so yeah something must be leaking some wheres. I don't see how you could get anymore accurate then that other then the actual sending unit or gauge giving more then one false readings. Which is possible but very unlikely.

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86 Mercedes 300SDL - 400k+ miles