98 Gasoline vs. 95 Gasoline: Key Differences Explained

When choosing the right fuel for your car, understanding the differences between 98-octane and 95-octane gasoline is crucial. Both fuels have distinct properties that affect engine performance, efficiency, and compatibility. Here’s a detailed comparison to help you make an informed decision.

1. Octane Rating: Resistance to Knocking

The primary difference between 98 and 95 gasoline is their octane rating, which measures a fuel’s resistance to engine knocking (premature combustion).

98 Octane: Higher resistance to knocking, making it ideal for high-performance engines with high compression ratios or turbochargers.

95 Octane: Slightly lower resistance, suitable for most standard engines without forced induction.

Using a lower octane fuel than recommended can cause knocking, reducing engine efficiency and potentially causing long-term damage.

2. Engine Performance and Efficiency

98 Octane: Allows for more aggressive ignition timing and better combustion in high-performance engines, leading to increased power and smoother acceleration. Some premium fuels also contain additional detergents that help keep the engine clean.

95 Octane: Provides sufficient performance for everyday driving but may not maximize the potential of high-compression engines.

3. Fuel Economy

While 98-octane gasoline can improve efficiency in performance engines, the difference in fuel economy for regular cars is often negligible. However, some drivers report slightly better mileage with 98 due to its optimized combustion.

4. Price Difference

98 Octane: More expensive due to its refined formulation and additives.

95 Octane: More affordable and widely available, making it the standard choice for most vehicles.

5. Which One Should You Use?

Use 98 Octane if your car’s manufacturer recommends it (common in luxury, sports, or turbocharged vehicles).

Use 95 Octane if your car is designed for standard fuel—using 98 won’t provide significant benefits unless the engine is tuned for it.