When I started driving arround 1992, it was 42.6p / L
I went to pick up 3 engines last summer from london, a round trip of about 600 miles ( I did take a bit of a detour ). I had all the seats out of the galaxy, drove at 50 MPH and managed 39MPG on the way down and 34 on the way back. The fuel cost made it unviable, but I visited a friend too so that counted as a cost benefit.
TT