Gas prices in Illinois
EIA does not publish a weekly retail gasoline price for Illinois. The federal survey prices the district Illinois sits in, Midwest (PADD 2), at $3.85 per gallon in the week of August 31, 2026, 22 cents below the US average of $4.07. Pump prices inside the district vary around that figure.
On-highway diesel for Midwest (PADD 2) is $5.57, 3 cents below the US diesel average of $5.60. EIA runs the diesel survey for California and the regions only, so every other state carries its district figure here. CPI-indexed excise. Chicago and Cook County stack a county tax plus city sales tax.
[EIA regional: Midwest (PADD 2)] Series EMM_EPMR_PTE_R20_DPG · State excise: 48.3 cents/gal · PADD 2
Illinois's pump-price cost stack
Every gallon breaks down into five named slices. Applying the shares to the $3.85 figure above, and to Illinois's own excise rate, the stack looks like this:
Crude / refining / distribution shares estimated from EIA Petroleum Marketing Monthly. Federal excise from FHWA Highway Statistics. State excise from the API Motor Fuel Tax Map and Tax Foundation 2026. [EIA · 31 Aug 2026] [API · 31 Aug 2026]
Border-state comparison
How the neighbours read in the same survey week. Neighbours inside the same EIA district carry the same published figure, which is why several rows can match exactly.
Use the border comparator to compute the per-tank difference where the two states fall in different EIA districts.
Metro-level EIA series for Illinois
EIA runs a separate weekly retail survey in one metro area inside Illinois:
- Chicago $4.243/gal EMM_EPMR_PTE_YORD_DPG
FAQ
What is the current average price of regular gas in Illinois?
EIA does not publish a weekly retail gasoline price for Illinois. The federal survey prices the district Illinois sits in, Midwest (PADD 2), at $3.85 per gallon in the week of August 31, 2026, 22 cents below the US average of $4.07. Pump prices inside the district vary around that figure. [EIA regional: Midwest (PADD 2)]
Does EIA publish a price for Illinois?
No. EIA prices the US, the five PADDs, three PADD 1 sub-districts, West Coast less California, ten metro areas and nine states. Illinois is not among them, so this page shows Midwest (PADD 2) and labels it.
What is Illinois's state gas tax?
48.3 cents per gallon state excise, plus the 18.4 cents federal excise. [API · 31 Aug 2026]