Occasionally using E-Plus 91 in a car that specifies Special 95 is usually fine for GCC-spec vehicles, but consistent use can reduce fuel economy and performance, especially in high temperatures.
In the UAE, the common fuel grades are E-Plus 91, Special 95, and Super 98. The main risk with using a lower octane than recommended is engine knocking (pre-ignition) under load, which is more likely during high-speed overtaking on the Dubai-Abu Dhabi highway or climbing steep grades like Jebel Jais in summer heat. For a typical GCC-spec family sedan like a Toyota Camry or Nissan Sunny, designed for our climate, the engine control unit (ECU) can adjust timing to prevent damage, but this leads to reduced efficiency.
| Comparison (GCC-spec Midsize Sedan) | E-Plus 91 (91 RON) | Special 95 (95 RON) |
|---|
| Typical Fuel Economy | ~13.8 km/l | ~14.5 km/l |
| Cost per 1000 km (at ~AED 3.05/l) | ~AED 221 | ~AED 210 |
| Performance Impact | Noticeable power lag when AC is on full blast in 45°C traffic | Smoother acceleration and consistent power |
- Fuel economy: A drop of about 0.7 km/l is common based on local owner reports, translating to roughly 5% higher fuel costs.
- Cost per km: Over 20,000 km/year, using the lower grade can add around AED 220 in extra fuel expenses.
- Annual depreciation: While not directly caused, potential carbon buildup from suboptimal combustion can affect long-term engine health and resale value.
The UAE's MOIAT emphasizes using specified fuel for optimal vehicle lifespan. The RTA Dubai's vehicle maintenance guides implicitly support this by advising adherence to manufacturer specifications to ensure roadworthiness and safety.
