I would like to thank Jessie for alerting me to an important consequence of high oil prices.
In Kigali a litre of petrol retails at 892 Francs per litre. A bottle of Primus beer retails at 450 Francs for 0.72 litres, making it cost 625 Francs per litre.
A 0.65 litre bottle of Mützig (my preferred Rwandese beer) unfortunately still costs the equivalent of 1077 Francs per litre. Therefore, I expect the fuel price to rise a little further.