1996 Ford Crown Victoria Owner's Manual - Page 70
1996 Ford Crown Victoria Manual
Page 70 highlights
Displayed DTE will not be equal to AVG ECON multiplied by the FUEL REMAIN value. This is because DTE is calculated using a method that takes into consideration the fuel economy of the last 500 miles (800 Km) driven. If "CO" or "CS" is displayed, this means that there is a problem with the fuel indication system and you should contact your dealer for service as soon as possible. AVG ECON - Average Fuel Economy Select this function to display your average fuel economy in miles per gallon or liters per 100 kilometers. Your message center computes this figure using the distance traveled and fuel used information. If you want to reset this function, press the RESET button while the average fuel economy feature is displayed. The average shown is the average since the reset. 77