How To Mid-Size-Between 130 and 160 cubic feet inside (pages 23-24). Use This Guide Large-160 or more cubic feet inside (pages 24-25). This "Gas Mileage Guide" gives /th estimated fuel economy in miles per gallonl( P6 of 1977 Truck Classes model year cars, station wagons, a4 d ;fit trucks. These vehicles were certified by EPA as of Small Pickups-Trucks having Gross Vehicle January 24, 1977. Weight Ratings (truck weight plus carrying All new car dealers are required tb capacity) under 4500 pounds (page 25). Standard Pickups-Trucks having GVWR's this Guide in their showroom. over 4500 pounds (page 26). Van/Speclal Purpose class-All other light How The Guide lo 0rg+$zed trucks (pages 27-28). In each size class, you will find the following To help you compare the fuel information on every model type: sized vehicles, the passenger wagons are grouped into Manufacturer and car line names their interior size, an The manufacturers are listed alphabetically. Under utillty. This means each manufacturer, the car lines are listed approximately the alphabetically. same class. Trucks are grouped in terms of gross vehicle weight Vehicle Description Each line in the Guide shows a different modei rn a car line. For each model. there are Car Classes designations of the engine size and the type of transmission ("A" for automat~c:"M" Two-Seater-Cars designed for manual). The type of each vehicle's fuel only two adults (page 20). system is indicated either by "FI" for fuel injection or by the number of barrels in the Sedans , . carburetor. The interior volume index column I lists two numbers (in cubic feet). The first is an Subcompact-Cars having up1 to 100 cubic feet a estimate of the size of the passenger of passenger and luggage volub (pages 9-13). compartment: the second, the size of the Compact-Cars having 100 to 1 0 cubic feet trunk or. in station wagons and hatchbacks, inside (pages 13-1 5). the cargo space behind the second seat. Mid-Size-Cars having 1 10 to 12 cuic feet inside (pages 16-1 8). Three Fuel Economy Estimates Large-Cars having more tha 1 0 cubic feet inside @age 19). City fuel economy reflects trips for local errands, driving to work, and general stop-and-go driving in d urban and suburban areas. Station Wagons I iI Highway fuel economy reflects long-distance Small-Less than 130 cubic fdt driving on non-urban roads and on interstate and cargo volume (pages 21-22). highways at a speed averaging about 50 MPH with no stops. 3 fuel economy is a weighted average of ich will be clearly marked highway estimates based on Federal ve additional information studies of average US. about that vehicle's characteristics and alue (which assumes nomy estimates that relate to a nd half highway driving) IS al vehicle within the model line. what the average driver can expect in overall cause of this, the Specific Label in some cases ummer driving on level roads after the car has I have fuel economy estimates that are different een broken in. from the General Label values in the "Gas Mileage Guide." Fuel Cost Also, the estimates on a Specific Label may not fall into the range of fuel economy estimates This value is an estimate of what you would pay listed for its class. This is because a specific for fuel in 1 year if you drive 15,000 miles and pay model may be more fuel efficient than the average 65 cents per gallon for gasoline (or 55 cents per gallon for diesel fuel). Check the Fuel Cost for the model type- additional information on yearly fuel costs at erent prices per galion. uel Costs, In er 10,000 Miles Example: If you pay an average of 60 cents per gallon and your car gets 12 MPG, your fuel cost for 10,000 miles of driving is $500. If you drive 20,000 miles a II you don't know which class a vehicle is in, turn year, your annual fuel cost will be twice this figure, or to the index where manufacturers and car lines $1,000. If you own a car that gets 20 MPG, your are listed alphabetically. Aiter each model name, annual fuel cost for 10,000 miles at 60 cents per the appropriate size class is given. By locating gallon is $300. that size class and the manufacturer, you will be able to find the specific model. The index is located on pages 28-32. Additional information is provided in this Guide on. o Factors that affect fuel economy (page 6). @ EPA fuel economy tests (page 8). All 1977 passenger .automobiles and light trucks are required to hwe gas mileage labels if they have gross vehicle weights of 6000 pounds or less. There are two types of labels. The one that will appear on most vehicles is the General Label. The fuel econcmy numbers on these labels are the same as those that appear in this "Gas Mileage Guide" and are based on an average of fuel economy test results for similar versions of a given model. Factors That Affec4 How You Drive Fuel Economy An engine that is already warmed up (such as one that was used in the last 4 hours) requires less The fuel economy numbers in this fuel to reach its most efficient operating condition result of carefully controlled tests than a "cold" engine (such as one in a car parked well-maintained test vehicles. Any overnight). Trip length also affects fuel economy. between the test conditions and the Shorter trips (under 5 miles) do not allow the your vehicle, your driving habits, and engine to reach its best operating condition, traffic conditions under which you whereas longer trips allow the peak operating will probably result in a different fuel temperature and engine condition to be obtained. from that listed for your car. This does not mean that you can save fuel by f emperature I increasing the length of your short trips. It does Summer temperatures (over 70°F.) mean that.by combining numerous short trips into fuel economy than winter a single, longer trip you can save fuel by reducing for example, there can be the total miles driven as well as taking advantage of your vehicle's warmed-up condition. percent fuel economy Smooth, even driving improves fuel economy combined MPG performance; therefore, try to avoid sudden stops and starts. By anticipating stop lights and Wind ' 1 intersections, you can slow down gradually.. Also, Wind can increase or decrease fuel avoid rapid accelerations. On the highway, you will Examples for a car that normally improve your fuel economy by driving at or below (combined) are: the 55-MPH speed limit. 18 MPH tailwind-about economy (2.4 MPG). Your Vehicle's Condition 18 MPH crosswind--+about l-percent lobs in fuel economy (0.2 MPG). The condition of your vehicle is important, too, for 18 MPH headwind-about 10-perce fuel economy reasons: fuel economy (2 MPG). Maintain your vehicle according to the manufacturer's specifications. On the average, Precipitation I a tuned-up vehicle gets approximately 3 to 9 Rain or snow, and the wet roads that re/suit, can percent better fuel economy than one that has cause an approximate 10-percent loss ib fbel not been properly maintained. economy (2 MPG for a 20-MPG vehiclel. I Keep the tires inflated to the proper pressure. Underinflated tires can cause a fuel economy Road Condition I loss. Rough or loose road surfaces (such For a more detailed technical discussion of the gravel) can also cause a fuel factors that affect fuei economy, write for ranging between 10 and 30 percent MPG for a PO-MPG vehicle). Cars "Factors Affecting Fuel Economy" on hilly roads than flat roads. The Public Information Center (PM-215) going downhill does not US. Environmental Protection Agency going uphill. Mountain Washington, D.C. 20460 greater fuel economy penalty. \ Fuel om tests conducted or approved by the U.S. Environmental Protection Agency (EPA). * These tests are performed on vehicles submitted y the auto industry to EPA to demonstrate ompliance with the requirements of the Ciean Air ct and the Energy Policy and Conservation Act. Each vehicle is tested under precisely controlled GREMLIN conditions by professional drivers in a laboratory dynamometer. The dynamometer is a machine that permits exact sirnul vehicle's operation under various conditions. Temperature is controlled in the laboratory in a range of 68" to 86°F. in order to provide the same temperature conditions for all AVANTl vehicles. AVANT! II ulates a 7.5-mile, stop-and-go trip with a speed range of 0 to 56 MPH, and an 5301/63OCSI average speed of 20 MPH. The trip takes 23 minutes and has 18 stops. Eighteen percent of the trip is spent idling, such as would be expected SKYHAWK in the city at traffic lights or in rush-hour traffic. Two kinds of engine starts are used. One is a cold CHEVRQLET 0 start, which is similar to starting a car in the CAMARO morning after it has been parked all night. The other is a hot start, which is similar to starting a vehicle after having parked it for a short time hile shopping. The information from this test is CHEVETTE then combined to represent the fuel economy of that vehicle during a realistic mixture of hot and cold starts during urban driving conditions. MONZA begins with the veh an average speed of about 50 MPH and lasts 13 DATSUN minutes.