Have vehicles gotten more fuel-efficient over the years? Between 1960 and 1999 the size and shape of automobiles in the United States has changed almost annually. The amount of fuel consumed by these vehicles has also changed.
The following table describes the average fuel consumption per year per passenger car in gallons of gasoline.
Year, t
1960 1970 1980 1990 1995
1997
1998 1999
Gallons Consumed Per 668 760 576 520
1530
538 544 552
Passenger Car
Determine the average rate of change, in gallons of gas per year, from 1995 to 1997.