40 mpg is achievable in stock aero crown vic (non police) if you go steady 40 mph. If you go steady 50 mph the 33mpg is possible. I had 93 vic before and did slow cruising on hiway to test effects of speed on mpg. I emptied trunk completely for tose tests. Now i have a 90 crown vic (.41 cd) and achieved a highest of 32 mpg at steady 50 mph.
I only changed all fluids to synthetics ( amsoil, schaeffers) and put nitrógen in all tires.
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