1993 Cadillac DeVille Owner's Manual - Page 146

"Fuel Used" can tell you the least costly way to make a familiar trip. Here's how youmight use it for your commute towork: EXPRESSWAY ROUTE 34 MILES 20.1 MPG 1.7 GALLONS USED L RESET 24 MILE! 7 8.5 MPG 1.3 GALLONS USED Using FUEL USED, you would find that you wouldsave money in fuel costs by taking the directroute towork, even though fuel economy was better on the freeway route. Push this to return "Avg" and "Fuel Used" to zero i I . I . . Oil Life Indicator Your Cadillac has an Oil Life Indicator feature.This tells you when you need tochange your engine oil. It's based upon the engine oil temperatures andyour driving patterns.