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.
yeart
1960
568
1970
760
1980
576
1990
520
gallons consumed per
passenger car
1995
530
1997
538
1998
544
1999
552
determine the average rate of change, in gallons of gas per year, from 1960 to 1990,