Premium Gasoline Prices in Joliet, IL

Updated April 5, 2026 — Prices updated regularly from EIA data

$4.15

Premium Gasoline (91-93 octane) per gallon

About Premium Gasoline in Joliet

Today's premium gas price in Joliet, Illinois is $$4.15 per gallon. If your vehicle requires premium, using regular risks engine knock, reduced performance, and potentially costly long-term damage.

When to Use Premium Gasoline

Best for: high-performance engines

Vehicle types: luxury and performance vehicles

Fuel Price Comparison in Joliet

Fuel TypePricevs. Premium GasolineOctane
Regular Unleaded$3.32$-0.8387
Premium Gasoline THIS PAGE$4.15—91-93
Diesel Fuel$4.49+$0.34N/A

Premium Gasoline in Nearby Cities

Naperville$4.28Aurora$4.18Chicago$4.13Schaumburg$4.47Des Plaines$4.52Elgin$4.45Evanston$4.33Waukegan$4.30
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Frequently Asked Questions

National Premium Gasoline prices average ${natPrice} per gallon. Joliet's current price of $$4.15 is {comparison} the national average. Regional refinery access and state tax differences drive most of the variation.
TOP TIER certification means the fuel exceeds EPA minimum detergency standards. Studies suggest TOP TIER fuels meaningfully reduce engine deposits vs. minimum-standard fuels. Most major brands (Shell, Chevron, BP, Costco) are TOP TIER certified.
Mixing grades is generally fine in practice — your engine's knock sensors will adjust timing accordingly. If your vehicle requires premium and you add some regular, no immediate damage occurs. Consistently running below the required octane in a performance engine is not recommended long-term.
{octaneInfo} Octane rating measures a fuel's resistance to premature ignition (knock). Standard regular is 87, mid-grade is 89-90, and premium is 91-93 in the United States.

Related Gas Price Pages

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