Illinois Fuel Prices Decreased This Week

The statewide average for regular unleaded fuel fell to $4.78 per gallon.

Updated on Sept. 29, 2026 in Buying/Selling

Isometric editorial illustration featuring a steel fuel storage tank and pipeline valve in a flat midwestern landscape. — Illinois statewide fuel prices saw a modest one-cent decline this week, with regular unleaded averaging $4.78 per gallon. AI Illustration. Upload story photo >

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Fuel prices across Illinois saw a modest decline on Monday, with regular unleaded dropping one cent from the previous day. Diesel prices also experienced a one-cent decrease to reach an average of $6.79 per gallon.

Why it matters

The recent price adjustment offers slight relief for drivers, though costs remain significantly higher than they were during the same period last year.

Regular unleaded gas dropped 13 cents compared to last week, while diesel prices fell by one cent daily to hit an average of $6.79 per gallon.

The details

The statewide average for regular unleaded fuel reached $4.78 per gallon on Monday, reflecting a steady downward trend over the past week. Diesel fuel followed a similar path, recording a one-cent decline compared to the price reported on Sunday.

September 2025: Regular unleaded cost $3.38 and diesel $3.75 per gallon.
September 21, 2026: Regular unleaded prices were 13 cents higher than Monday.
September 27, 2026: Regular unleaded prices were one cent higher than Monday.
September 28, 2026: Fuel and diesel price averages were recorded.

Roadmap

Gas prices in the state continue to fluctuate based on broader shifts in regional fuel supply and demand dynamics. These price changes reflect the ongoing volatility of the energy market as consumers navigate seasonal transitions.

Drivers in Illinois should note that while prices have dipped, costs remain substantially higher than they were last year. This ongoing gap may continue to influence monthly commuting budgets and household transportation spending.

The takeaway

Maintaining regular vehicle maintenance and efficient driving habits can help mitigate the impact of fluctuating pump prices on your wallet. Monitoring weekly price trends may also assist in identifying the most cost-effective times to fuel up.