1997 Ford Aerostar Owner's Manual - Page 267

You may need to crank the engine several times before the fuel system starts to pump fuel from the tank to the engine. Fuel Economy Fuel economy is an estimate of the efficiency of your vehicle and can be calculated as Miles Per Gallon (MPG) or Liters Per 100 Kilometers (L/100K). Do not calculate the fuel economy during your vehicle's break-in period. This would not be an accurate estimate of how much fuel your vehicle will normally use. To calculate fuel economy: 1. 2. 3. Fill the tank completely and record the initial odometer reading. Every time you buy fuel record the amount (in gallons or liters) purchased. After at least three to five tankfuls, fill the fuel tank and record the final odometer reading. Use these equations to calculate your fuel economy: (gallons used) 4. u English: MPG = (total miles driven) Ö u Metric: L/100k = (100 x liters used) Ö (total kilometers driven) Comparisons With Environmental Protection Agency (EPA) and Transport Canada (TC) Fuel Economy Estimates EPA and TC fuel economy figures are obtained from laboratory tests under simulated road conditions and thus are estimates which may not reflect the actual conditions you experience or your personal style of driving. The EPA or TC fuel economy estimate is not a guarantee that you will achieve the fuel economy shown. 268