Regular vs Midgrade vs Premium Gas

Regular, midgrade, and premium gasoline mainly differ in octane rating at the pump. Premium does not automatically contain more energy or make every engine perform better.

Regular

In much of the United States, regular gasoline is typically 87 AKI, though local grades can vary.

Midgrade and premium

Midgrade sits between regular and premium. Premium usually carries a higher AKI number such as 91 or 93 in many markets.

Required versus recommended

Some engines require premium fuel. Others recommend it for maximum performance but allow regular. Many are designed for regular. Follow the owner's manual.

Do not buy octane you cannot use

An engine designed for regular generally does not gain a useful benefit from premium simply because the number is higher. Use the grade the manufacturer specifies.

Quick checklist

Use the product label, manufacturer directions, and the specific requirements of your situation. Compare the complete product or system rather than making a decision from one marketing phrase, ingredient, or number.