Estimated reading time: 3 minutes
The DMPR diesel price calculation error refers to a significant clerical mistake made by South Africa’s Department of Mineral and Petroleum Resources (DMPR) in early May 2026.
The error led to an overstatement of the diesel price increase for the month, which the department had to correct via an official erratum just hours before the new rates took effect.
The Error Details
During the calculation of fuel prices for May 2026, the department miscaptured a temporary fuel levy reduction intended to cushion consumers against rising costs.
- The Mistake: A planned 93.00 cents per litre reduction in the fuel levy was erroneously entered into the system as 0.93 cents per litre.
- The Impact: This decimal-point error caused the initial announcement to state that the wholesale price of diesel would increase by R6.19 per litre.
The Correction
After identifying the oversight, the DMPR issued a revised statement on May 5, 2026, correcting the figures:
- Revised Increase: The wholesale price increase for both grades of diesel was lowered to R5.27 per litre (a reduction of 92 cents from the original incorrect announcement).
- Effective Date: These corrected prices went into effect on Wednesday, May 6, 2026.
Summary of May 2026 Price Adjustments (Corrected)
| Fuel Type | Adjusted Increase (per litre) |
| Diesel (0.05% & 0.005% sulphur) | R5.27 (Originally announced as R6.19) |
| Petrol (93 & 95 ULP/LRP) | R3.27 (No error reported) |
| Illuminating Paraffin | R4.22 |
| LPGas (Retail) | R5.07/kg (Gauteng) / R5.78/kg (Western Cape) |
Why This Matters
The error was described by the department as “highly regrettable” because it caused significant confusion for logistics companies, farmers, and transport operators who use large volumes of diesel and rely on these announcements for budgeting. The miscalculation occurred despite the government’s attempt to extend the temporary fuel tax reprieve to combat high inflation and global oil market volatility.
If you are seeing a price discrepancy at a fueling station, ensure they have updated their systems to reflect the May 6th Erratum rather than the initial Monday announcement.
FAQ: May 2026 DMPR Diesel Price Calculation Error
The Department of Mineral and Petroleum Resources (DMPR) miscaptured the value of the temporary fuel levy reduction. A planned 93.00 cents per litre reduction was accidentally entered into the system as 0.93 cents per litre, leading to an over-calculated price hike.
Initially, the DMPR announced a diesel price hike of R6.19 per litre. Following the correction (Erratum), the actual increase was adjusted down to R5.27 per litre.
The corrected fuel prices officially came into effect at midnight on Wednesday, May 6, 2026.
No. The calculation error was specific to diesel grades (0.05% and 0.005% sulphur). Petrol prices (93 and 95 ULP) remained at the originally announced increase of R3.27 per litre.
Pingback: Vanguard Error VAN 57 | Check Service Status - Technical Help, Support and Guidance