Back in the '80's I owned one of them Hyundia Pony's, It cost $14.00 (canadian) to fill er up and that would last nearly 500 km's. The unleaded gas I bought was around .44 - 49 cents per litre out in the "country", now those same country gas stations are in new urban areas.. The regular gas of the day (still had leaded) cost about 38 cents-litre.
I have seen that a few times, were the station runs out (out= really low since the tank design prevents them from being pumped dry) of regular fuel and offers the mid grade fuel for the same price, since the mark up between reguklar and midgrade is very small and the mark up on regular to begin with is about 20-28% the station will still make its profit on the volume of fuel they sell, the larger the tank being filled the more profit for the station. Seeing how many stations get a discount for large volume buys, the closer their tanks are to empty when the tanker comes the cheaper they (the stations) get the fuel for.
Don't forget the 6 pack of water for $10 or the $5 bundle of firewood. as well as the $4 litre of oil.
Snow