- The short answer is that gasoline does not vary from station to station. Gas stations purchase their gasoline from the same suppliers, and those suppliers share the same pipelines. Federal regulations require that detergents be added to all gasoline to protect cars' engines. Fuel quality between stations differs minimally, if at all.
- The longer answer involves station maintenance. Large oil companies, such as Exxon and Shell, require their stations to maintain company standards regarding pump technology and cleanliness. Outdated pumps that aren't maintained as often or as thoroughly can affect the overall quality of gas.
- Some companies claim their additives stand above their competition. While it may be true that some additives are of better quality than others, additives make up only a small portion of the gasoline mixture, so the overall effect is diluted.
- Gas stations located at busy intersections, on major highways or by popular tourist attractions often take advantage of the prime real estate and raise the price. Their fuel quality is no different than the fuel quality at stations located elsewhere. Some regions of the country see lower prices than others due to their proximity to refineries.
- Experiment. The biggest difference among gasoline types is in the octane value, and it's likely that the 89-octane gas purchased at the major oil conglomerate is bought from the same supplier as the fuel being sold at the convenience store. If your car runs well on the cheaper gas, you can travel assured that your fuel choice is fine.
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