Table 6 $10\cdot 15$-mode fuel efficiencies of passenger automobiles (kei, ordinary, and hybrid vehicles) during 1981–2007 in Japan (unit: km/L)

1981

13.1

–

17.7

1982

13.7

–

18.5

1983

14.0

–

18.6

1984

14.0

–

20.4

1985

13.8

–

20.6

1986

13.8

–

19.9

1987

13.5

–

20.9

1988

13.3

–

18.8

1989

12.7

–

17.9

1990

12.4

–

17.4

1991

12.1

–

15.9

1992

11.6

–

16.7

1993

11.7

–

16.2

1994

11.8

–

15.9

1995

11.6

–

16.5

1996

11.8

–

15.4

1997

11.9

31.4

15.8

1998

12.1

31.4

15.8

1999

12.3

31.4

15.7

2000

12.6

31.4

16.6

2001

13.3

31.4

16.6

2002

13.9

26.6

17.0

2003

13.9

23.6

17.7

2004

13.9

26.8

17.8

2005

14.1

33.3

17.8

2006

13.9

31.1

18.1

2007

14.4

29.8

18.7

Average

13.0

29.8

17.6