Dimensionally, fuel economy is miles divided by gallons.  Then, presented with more
than one fuel economy value, an approach to averaging the values is to compute the result by
determining the total miles traveled and dividing that by the total gallons used.

Example: A motorist’s fuel economy log for May shows that 704 miles were accumulated
around town in which the fuel economy was 16 mpg, and one 216 mile highway  trip was taken
on which the fuel economy was 24 mpg.  What is the average fuel economy for May?

The total miles are 704 + 216 = 920.  The total gallons thus are 704 / 16 = 44 plus
216 / 24 = 9 or a total of 53 gallons.  The average mpg is 920 / 53 = 17.4 mpg.  Notice that the
arithmetic average of the two fuel economy values (16 + 24) / 2 = 20 mpg gives an individual
result that is higher than the total miles/total gallons result.

Content Summary : This guide is a public service to help reducepollution and the amount of materialslandfilled. Listing in this directory is not arecommendation or endorsement by the County of San Diego . Always call ahead to confirm hours of oper-ation and assure acceptance of materialsyou wish to recycle. All information con-tained in this directory is supplied by serv-ice providers. Because the industry is con-stantly changing, some facilities may havereduced or expanded the types of materialsthey take. Make sure you find out the termsand conditions that are required for eachmaterial. GUIDELINES FOR RECYCLING AUTO FLUIDS 1. Never pour anything into the storm drains, gutters or street. 2. Use all fluids and share with neighbors. Motor oil and most clean auto fluids will last for several years. 3. Take used motor oil, filters, batteries, and antifreeze to a locla recycling center listed in this guide. Most facilities accept motor oil and filters for free. 4. As a last option, take materials to a Household Hazardous Waste facility. Download PDF Book Automotive Recycling Guide