Coastal prices apply to Cape Town and the Western Cape; inland (Gauteng) prices run roughly 80 to 90 cents higher per litre because of the transport-and-distribution component built into the regulated price formula. The figures below reflect the projected adjustment from the Central Energy Fund as of 30 April; the DMPR will publish the final values before midnight on 5 May.

Every monthly fuel adjustment in South Africa is a function of three variables: the international price of refined fuel (the Basic Fuel Price, indexed to crude oil and global refining margins), the rand-dollar exchange rate, and the levies and margins added domestically. In May 2026, all three are pulling in the same direction - but the dominant force is unambiguously the global oil price.

The chart below traces what a litre of 95 unleaded has cost at a Cape Town forecourt every month since June 2025. The story is one of remarkable stability through most of the period, with prices drifting downward through late 2025 and bottoming near R19.47 in March 2026 - and then a sharp two-month break upward as the Hormuz crisis reshaped the global oil market.

The numbers below assume a full tank and Cape Town coastal pricing. Diesel costs include a representative R3 per litre retail margin on top of the wholesale price; actual pump prices in the city centre and along the M3 corridor typically fall within R0.50 of the calculated value. Comparing April (R22.53 for petrol 95, R28.35 retail diesel) against May (R24.38 and R32.35 respectively) gives the clearest read on the household-level pain.

Two things are worth understanding clearly. First, Treasury's intervention is not a permanent restructuring of how fuel is taxed - it is a temporary cushion, and the cushion is on a published expiry schedule. Second, the relief is being recouped not through fresh taxes but through "underspending and higher-than-expected revenue", per Treasury's own statement; that means it is fiscally neutral on paper but politically costly when relief unwinds.

Direct fuel costs are the visible part of the May 2026 adjustment. The less-visible part - and the part that is likely to dominate household budgets through the second half of 2026 - is the way diesel feeds into every other price in the economy. South Africa moves roughly 80% of its inland freight by road, which means a R5 per litre rise in diesel translates almost mechanically into higher transport surcharges within four to six weeks. The Bureau for Food and Agricultural Policy has already warned that this round of fuel hikes will lift food prices through the second quarter.

The four channels through which fuel reaches the rest of your spending

Food and groceries. Bread, milk, fresh produce and most basic food items move from production sites in the Western Cape interior or from Gauteng on diesel-powered trucks. Pick n Pay, Shoprite and Woolworths all maintain fuel-cost clauses in their supplier contracts; these are typically renegotiated quarterly. Expect food inflation to lag the fuel hike by roughly six weeks, with the first visible shelf-price increases appearing in mid-June.

Public transport. SANTACO, the South African National Taxi Council, has already signalled that minibus taxi fares will rise. For roughly 16 million daily taxi users nationally - including the dense morning flows from Khayelitsha, Mitchells Plain and Delft into the Cape Town CBD - even a R1 fare increase compounds rapidly across a working week. Golden Arrow and MyCiTi have so far absorbed costs through subsidy buffers, but the May diesel jump will likely test that absorption capacity.

Inflation and interest rates. Investec Chief Economist Annabel Bishop has described the May 2026 fuel adjustment as "an inflation event, not a motoring inconvenience". The expected contribution to monthly CPI is roughly 0.6 percentage points, potentially lifting May CPI to 4.2% - well above the 3.7% baseline forecast. The South African Reserve Bank's Monetary Policy Committee meets on 28 May; markets are pricing in a 25-basis-point rate hike as a possible response, which would feed through to mortgage rates, vehicle finance and credit-card minimum payments within weeks.

Logistics contracts. For Cape Town businesses with quarterly or annual logistics contracts negotiated when diesel sat below R20 per litre, the May adjustment is now a renegotiation trigger. Most freight contracts include fuel-surcharge clauses indexed to the wholesale diesel price; the +R4.96 May move alone is enough to trip those clauses. Expect courier costs - Aramex, DHL, the Postnet network - to recalibrate within the next 30 days.

Forecasting fuel prices five weeks out is straightforward; forecasting them five months out is largely a guess about geopolitics. The three scenarios below bracket the realistic outcomes for petrol 95 at the Cape Town coast through to August 2026, holding the rand at R16.30-R16.65 and assuming the levy schedule plays out as Treasury has announced.