1994 Cadillac DeVille Owner's Manual - Page 265

treadmill. These procedures ensure that each vehicle istested under identical conditions. There aretwo different fuel economy estimates for each vehicle, one for city drivingand one for highway driving.To develop these two estimates, separate tests are used to represent typical everyday city and rural driving. The test used to determine the fuel economy estimate simulates a 7.5 city mile (12 km), stop and go trip with an average speed of 20 mph (32 km/h). The trip takes minutes and has 18 stops. About onefifth of the 23 time is spent idling, as in waitingat traffic lights or in rush hour traffic. Two kinds of engine starts are used: a cold start, which is similar to starting a car the morning after it has been parkedall nightand a hot in start, which is similarto restarting vehicle after it hasbeen warmed up, a driven and stopped for a short time. The testused to determine thehighway fuel economy estimate represents a mixture of "non-city" driving. Segmentscorresponding to different highways are included. The test kinds of rural roads and interstate trip simulates a 10 mile (17 km) with an average speed of 48 mph (77 km/h). The testis run from a hot start has little idling time and no and stops. To assure that the economy numbers are most useful for consumers, fuel the EPA adjusts these laboratory test results to account for the difference between controlled laboratory conditions and actualdriving on the road. The laboratoryfuel economy results are adjusteddownward to arrive at the estimates on the fuel economy windowsticker and the Gas Mileage Guide. The city estimate is lowered by 10 percent and the highway results. estimate is loweredby 22 percent from the laboratory test Experience has proven that theseadjustment.smake the mileage estimates correspond more closely to the actual fuel economy realized by the average driver. Even though thesefigures are adjusted,they stillrepresent what the average driver will get. Your fuel economy may be significantly higher or lower, depending on how, when,and whereyour vehicleis driven. Here are some things you cando to increase fuel economy; 0 Combine errands into onetrip. 0 Turn the engineoff rather than letting idle for more than a minute. it