Farmington IL Gas & Diesel Watch: Casey’s pump prices show regular $4.19, diesel $5.49 (June 26)

Farmington drivers and fleets got a fresh local price snapshot on June 26, 2026. Casey’s (84 S Main St) is listing Unleaded E 87 (regular) at $4.19/gal and #2 Diesel at $5.49/gal. Casey’s fuel-price page says the listing was updated 1 hour ago, and that the actual pump price can vary.

Casey’s in Farmington: regular and diesel prices right now

At the Casey’s store on S Main Street, the regular pump line is showing $4.19/gal for Unleaded E 87. Diesel is higher, showing $5.49/gal for #2 Diesel. Because this is a single-station check, readers may still see different prices at nearby pumps.

AAA Illinois averages: down slightly vs. yesterday, still far above last year

Looking beyond one station, AAA’s Illinois averages show a modest pullback since yesterday (June 25, 2026). For regular, the Illinois average is $4.190/gal today versus $4.208/gal yesterday. For diesel, today’s Illinois average is $5.143/gal versus $5.176/gal yesterday.

The bigger story is how far prices remain above earlier baselines. Compared with last month, AAA shows regular at $4.925/gal a month ago versus $4.190/gal today, and diesel at $5.999/gal a month ago versus $5.143/gal today. Compared with last year, regular is up from $3.498/gal to $4.190/gal, and diesel is especially higher from $3.732/gal to $5.143/gal.

EIA national weekly trend: both regular and on-highway diesel down from last week

For national direction, the U.S. Energy Information Administration’s latest weekly retail estimates (release date June 23, 2026) show both fuels easing week-over-week. In the most recently listed week (06/22/26), regular gasoline is estimated at $3.914/gal and on-highway diesel at $5.147/gal. Those are below the prior week values on the same EIA table (06/15/26): $4.052/gal for regular and $5.305/gal for diesel.

So what for Farmington drivers and fleets

With diesel still running well above regular, the impact tends to hit hardest for anyone fueling for commuting mileage, deliveries, contractors, or service and farm fleets. Even when prices ease compared with yesterday, that bigger per-gallon diesel premium can swing the total cost of weekly fueling.

If you’re planning a tankful today, compare at more than one pump when you can—small differences add up quickly over a work week.

Share back: What are the highest and lowest regular and diesel prices you’re seeing right now in/near Farmington?

Sources

• Casey’s (84 S Main St, Farmington) — Fuel prices page
• AAA Gas Prices — Illinois state averages (regular and diesel, with daily/weekly/monthly/yearly comparisons)
• EIA — Weekly Retail Gasoline and Diesel Prices (U.S. national context)