VERY bad mileage on 1995 Chrysler Cirrus

head casket and distributor replaced. Oil in cylinders. Also the tach will go up and down, but only when at full operating temperate and complete stop. Oil mileage is about 10 mpg. Help! tHANK YOU

Asked by for the 1995 Chrysler Cirrus
what do you mean oil mileage? you may have a bad eng
I have to agree 10 mpg of oil.