1) The year is 1975. The characters are in London. One has a van. How many miles per gallon would the average van get? Make is unimportant.
2) What capacity might the tank be (how many gallons--or whatever the British measurement would be)? Again, the make of the van doesn't matter.
3) How much did gas (petrol) cost in 1975 in Britain? Estimations are fine.
Thanks guys--great as usual.