Many drivers assume that premium gasoline offers better performance and protection for their vehicle, but that is not always the case. Depending on your engine type and manufacturer recommendations, premium gas could be a necessary investment—or an unnecessary expense. Understanding octane ratings and engine compatibility can help you make the right choice and avoid wasting money at the pump.

What Does “Premium” Gas Really Mean?

Premium gasoline typically has a higher octane rating than regular gas. While regular gas usually has an octane rating of 87, premium gas has a rating of 91 or higher. Octane measures a fuel’s ability to resist “knocking,” which is the rattling or pinging sound that can occur when air and fuel mixtures ignite prematurely in the engine.

When You Need Premium Gas

If your vehicle’s owner’s manual specifies “premium fuel required,” you must use premium gas to avoid engine damage and reduced performance. Ignoring this recommendation can result in expensive repairs and lower long-term fuel efficiency.

Examples of vehicles that typically require premium fuel include many luxury cars and high-performance models from brands like BMW, Audi, and Mercedes-Benz.

When Regular Gas Is Just Fine

If your owner’s manual states “premium fuel recommended” or does not mention premium at all, you can safely use regular gasoline without harming your vehicle. According to extensive testing by AAA, vehicles that merely recommend premium gas do not gain significant improvements in horsepower, fuel economy, or emissions when using it. The added cost at the pump—often 20 to 50 cents more per gallon—rarely justifies any minor performance gains for these vehicles.

How to Check Your Car’s Fuel Requirements

• Refer to your vehicle’s owner’s manual for clear fuel recommendations.

• Look for labels near the gas cap or on the fuel door.

• Check the manufacturer’s website or consult a dealership if you are unsure.

Tips for Saving on Gas, Whether Regular or Premium

• Use apps like GasBuddy to find the best prices in your area.

• Maximize savings with cashback tools like Fluz, which allows you to earn instant cashback on fuel purchases by buying digital gift cards for brands like Shell and BP.

• Maintain your vehicle with proper tire pressure, timely oil changes, and air filter replacements to improve fuel efficiency no matter which grade of gas you use.

The Bottom Line

Unless your vehicle specifically requires premium gasoline, you can stick to regular gas and invest the savings elsewhere. Understanding octane ratings and following your car’s manufacturer recommendations ensures you are not overpaying at the pump without any real benefit. If you are still unsure, consult a trusted automotive expert or your dealership for personalized advice.