Many drivers assume that using premium gas will improve their car’s performance, fuel economy, or engine lifespan. But unless your vehicle specifically requires higher octane fuel, paying extra for premium is likely a waste of money. Here’s what the experts—and real-world tests—say about whether premium gas is worth it.
- Understand What Premium Gas Actually Is
Premium gas has a higher octane rating, typically 91–93 compared to 87 for regular. Octane rating measures a fuel’s resistance to knocking (premature combustion) inside your engine. It does not measure fuel quality or engine cleanliness. - Check Your Owner’s Manual First
If your car’s manual states that premium gas is required (not just recommended), then using regular gas could damage your engine or reduce performance. Vehicles like certain BMW, Audi, and high-performance models need high-octane fuel to function properly.
If premium fuel is only recommended, your car can safely run on regular gas without damage—although you might experience slight reductions in horsepower under heavy acceleration.
- Fuel Economy Changes Are Minimal
According to a AAA study on premium fuel, most vehicles designed for regular gasoline showed no improvement in fuel economy or performance when running on premium. In tests, the differences were typically less than 2%—not nearly enough to justify the 15–30% higher price at the pump. - When Premium Might Help
Premium fuel can occasionally benefit cars under extreme conditions, such as towing heavy loads, driving at high altitudes, or extreme heat. In those situations, higher octane fuel may prevent knocking even in engines designed for regular gas. However, for everyday driving, the benefits are minimal. - Using Premium in Regular Engines Can Be a Waste
Paying extra for premium gas when your car does not need it offers no meaningful improvement. That money is better spent on regular vehicle maintenance, tire care, or driving habits that actually impact fuel efficiency.
Key Takeaways:
- Only use premium gas if your car’s manufacturer requires it.
- “Recommended” means regular gas is acceptable for everyday driving.
- Premium gas does not improve fuel economy or engine life for most vehicles.
- Follow maintenance schedules and proper driving techniques instead to maximize performance and savings.
By following the guidance in your owner’s manual—not advertising myths—you can make the right fueling choice and keep more money in your pocket every time you fill up.
