Well whatd'ya know? It seems we have an artist in our midst. From Alan Belson:

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Fuel prices in 1987, pic is part of a painting I did in the autumn of that year, [ during my blue period! ]. While doing the preliminary sketches one rainy night, I almost got arrested by the local police, on their way back from the chip shop - they thought I was casing the joint!

Prices will be in UK gallons - and will be 4 star / 2 star, 98 / 95? There is a third price, but it's just blobs of paint- this would be leaded I guess, I forget the exact details, but seem to remember you couldn't get the leaded nozzle [red color] into the Rover; unleaded nozzles were colored green and smaller in diameter. Diesel is over 10p a gallon cheaper than the gasoline though.

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I think Alan meant to say that the third price would be for unleaded, since 2-star and 4-star were regular leaded.