Shell 135.9c per litre (131.9c if discounted). 100m up the road, 7-Eleven 137.9c per litre. Shell cars packed lining up out onto the road. 7-Eleven cars could be counted on one hand. Shell wait for approx. 15 mins. (from past experience), 7-Eleven immediate. Price saving on 40L, 80c. ($2.40 if discounted). Would you wait ~15mins to save $2.40?