Updated May 20, 2026 — Prices updated regularly from EIA data
$3.32
Average Regular Unleaded — Joliet, Illinois
Current Gas Prices in Joliet
The average cost to fill up in Joliet, Illinois is $$3.32 per gallon for regular gas right now. Compared to the national average, Joliet drivers are paying $1.17 below the national average, reflecting local market dynamics.
Fuel Type
Price / Gallon
Grade
Trend
Regular Unleaded
$3.32
87 octane
▼ Falling
Mid-Grade
$3.75
89 octane
▲ Rising
Premium
$4.03
91-93 octane
▬ Stable
Diesel
$4.14
N/A
▼ Falling
Price Comparison
Joliet Average
$3.32
Regular Unleaded
Illinois State Average
$3.36
$0.04 below the Illinois average
National Average
$4.49
$1.17 below the national average
About Gas Prices in Joliet
The Joliet fuel market reflects Illinois's broader pricing environment while adding local demand characteristics. With a growing population and rising commuter traffic, demand pressure in Joliet is steady. Warehouse club stations and discount brands regularly beat street prices by 10-20 cents per gallon.
Gas Prices by Brand in This City
Estimated prices based on brand modifiers. Sorted cheapest to most expensive.
Costco offers the cheapest gas wherever it operates in the Joliet area. Among street stations, Circle K, Speedway, and Wawa (in applicable markets) consistently offer below-average prices. Shell, Chevron, and BP typically price above the local average.
At today's Joliet average of $$3.32 per gallon, a standard 13-gallon sedan tank costs ${fillCost} to fill. A larger 20-gallon SUV or truck tank runs ${truckFill}. Choosing the cheapest local station can save $3-5 on each fill-up.
Monday and Tuesday are statistically the cheapest days to buy gas in most US cities including Joliet. Prices rise Thursday through Sunday as weekend driving demand increases. Filling up Tuesday afternoon before price adjustments is a reliable strategy.
Joliet and surrounding cities typically track similar fuel prices given shared supply infrastructure. Differences of 5-15 cents between nearby cities are common depending on local tax differences and competition levels.
A 10-cent savings on 15 gallons equals $1.50. If the cheaper station is 5 miles away and your car gets 25 MPG, the detour costs about 0.4 gallons. Savings above 15 cents per gallon are consistently worth moderate detours.
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