I think I was paying about 60c a ltr in Mount Isa for my first car in 1986. Lived in Brisbane in 1987 and was paying just over 50c, apart from a good old price war where it got down to about 38c for a few weeks.

I remember being shocked paying $1.12 for diesel in Boulia in 2002. More than a dollar, highway robbery, even out there..!