My Cadillac Convertible 1953 has an extremely high fuel consumption; 8,0 miles per gallon !!! I have checked compression, vacuum, carburetor and levels of the floats, ignition and the fuel pump. All of it seems ok, and the car is running perfectly. The spark plugs are also checked with right colour. The only trouble is the high fuel consumption !!! Where does the fuel go !!! The cylinder heads are renovated.The pistons and skirts are also changed. Does somebody have an idea of where to find the failure ??? No hole in the gas tank...... Best Regards, Peter