Pay Less at the Gas Pump

Over the past few months, everyone has been painfully aware of high prices at the pump. But many drivers don’t realize important facts about automotive performance needs, unnecessary costs, and confusion generated by different gasoline grades. The three gasoline grades often confuse drivers because the price difference suggests that premium fuel must be “better” for your car. In most cases that is not true. The most important factor is using the octane grade your vehicle manufacturer recommends. If your car is designed for regular 87-octane gasoline, buying a premium blend usually will not improve your vehicle’s performance, fuel economy, or engine health. Octane is not a measure of energy content or cleanliness. Instead, it is a measure of resistance to engine knocking. Unless your engine has a high compression ratio, turbocharging, or the manufacturer specifically calls for premium fuel, higher octane is usually an unnecessary added expense at the pump.

For everyday driving, all gasoline grades are broadly similar in quality when they come from a reputable station and meet top-tier detergent standards. What matters most is whether your fuel is fresh, your injectors are clean, and your car has received proper maintenance. A more expensive blend may be useful only if your owner’s manual says so, or if you notice knocking or pinging in a vehicle that allows the use of higher octane under heavy loads. Otherwise, you are mostly paying extra at the pump for a benefit your car cannot use.

In southern Arizona, heat changes the equation a little, but not in the way many people think. Extreme temperatures and heavy air-conditioning use do increase engine load, yet that does not automatically mean you need premium fuel. Modern engines and engine controls are designed to handle heat. If the manual says regular fuel is fine, it is still fine in Arizona summer traffic with the A/C running. The smarter approach is to keep your car’s cooling system healthy, maintain tire pressure, and ensure the air filter and spark plugs are in good condition.

As for having a full tank, that does matter more than many drivers realize. In very hot climates, a fuller tank helps reduce fuel evaporation and limits the amount of air and moisture inside the tank. That can slightly reduce the risk of condensation, which is more relevant during temperature swings than during steady summer heat. A fuller tank can also be helpful during long drives in remote areas, where fuel stops may be farther apart. That said, there is no need to keep the tank constantly topped off. Just aim to avoid running it very low for long periods.

The bottom line: use the octane grade your car was built for, not the most expensive one at the pump. In southern Arizona, a reasonably full tank is a good habit, but premium fuel is not a substitute for good maintenance.

At Green Valley Automotive, we offer the best- trained and most knowledgeable ASE-certified technicians in the area. Using the newest generation of technology and computer-enhanced diagnostics, we can handle tune-ups, repairs and maintenance across every make and model of passenger car, SUV or light truck. Whether it’s your first time visiting Green Valley Automotive  or you’re one of our regular customers, we’ll answer all your automotive questions while helping to keep your vehicle performing safely and smoothly. 

Stop into Green Valley Automotive or call us at (520) 625-2500 for an appointment. We offer complimentary shuttle service to residents of Green Valley. You can also visit us at www.greenvalleyautomotive.com. Remember, at Green Valley Automotive: “We’ll treat you right!”