What brand of gas is best for your car?

There's no single "best" brand of gasoline for all cars. The differences between major brands are usually minimal in terms of engine performance and fuel economy. They all generally meet the minimum quality standards set by the government (e.g., the required octane rating).

Any perceived differences in performance are often more related to:

* Octane rating: This is the most significant factor. Using a higher octane fuel than your car's manufacturer recommends won't provide any benefits (and may even be detrimental), while using a lower octane can lead to knocking (engine pinging) and potential damage. Check your owner's manual for the recommended octane rating.

* Fuel additives: Brands may use different additives that claim to improve engine cleanliness or performance. The impact of these additives is often debated and difficult to quantify consistently.

* Regional variations: The formulation of gasoline can vary depending on local regulations and the refining process used at specific plants. A brand's performance might differ slightly from one location to another.

* Individual car variations: Some cars might seem to run slightly better on one brand versus another, but this is likely due to variations mentioned above or even a placebo effect.

In short: Focus on using the correct octane rating specified in your car's owner's manual. Beyond that, the brand you choose is largely a matter of personal preference, price, and convenience.