1997 Ford Crown Victoria Owner's Manual - Page 38

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. If you calculate your average fuel economy by dividing miles traveled by gallons used, your figure may be different than displayed because of: u Your vehicle not being perfectly level during fill-up u Differences in the automatic shut-off points on the fuel pumps at service stations fill-up to another u Variations in top-off procedure from one u Rounding of the displayed values to the nearest 0.1 gallon (liters) on the fuel gauge. 35