[wcamaddox]

I dunno about the leaking or bad gaskets but my mechanic friends told me to get rid of the red antifreeze(if you havent already) and go with the green stuff. For some reason thered evaporates away for no explained reason and will corrode the aluminum bits of your motor(something to do with an iron block and the aluminum creates a corrosion happy environment with the red stuff. As far as yuor gas mileage have you changed the o2 sensor lately? If its bad you may have a rich condition that will effect gas mileage and performance.Also dependig on where (if its a bad head gasket) the gasket is bad you may be able to see bubbles coming up to the radiator cap while the car is running from the air under compression in the cylinder.