Remember when garage forecourts had Redex and 2stroke oil dispensers on them. 
Yep.
I had a Raleigh Runabout 50cc when I was 16 (1974)
Petrol was 10/- a gallon and you added your own 2 Stroke oil from the squirter thing on the forecourt.
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My Father had a Raleigh Supermatic (with a belt than ran up a taper as the engine speed increased to sort of give a higher gearing and a pillion seat) that I "tore" about on. He never trusted the machines and always mixed the fuel himself at home.
10/- a gallon works out at about £1.32 a litre today according to the inflation calculator. Average earnings have outstripped inflation (so they tell me) over this time so fuel today is cheaper!
When I started in 1970 fuel was 3 gallons for a £1.