Cheapest Gas in Decatur, IL
Updated April 5, 2026 — Prices updated regularly from EIA data
$3.52
Lowest price at Costco in Decatur
Finding Cheap Gas in Decatur
Finding the cheapest gas in Decatur, Illinois can save you hundreds per year. Today's lowest regular price in the area is $$3.52 per gallon — $$0.25 less than the highest local price.
Maximum Savings in Decatur
Choose Costco over Chevron
$0.25 per gallon
$3.75 per 15-gallon fill • $12.00 per year (est.)
Cheapest Brands in Decatur
| Rank | Brand | Est. Price | Savings vs. Most Expensive |
|---|---|---|---|
| #1 | Costco | $3.52 | $0.25 |
| #2 | Speedway | $3.64 | $0.13 |
| #3 | Circle K | $3.65 | $0.12 |
| #4 | Sunoco | $3.68 | $0.09 |
| #5 | Marathon | $3.69 | $0.08 |
| #6 | BP | $3.71 | $0.06 |
| #7 | Mobil | $3.72 | $0.05 |
| #8 | Exxon | $3.73 | $0.04 |
| #9 | Shell | $3.75 | $0.02 |
| #10 | Chevron | $3.77 | $0.00 |
Gas Saving Tips for Decatur Drivers
- Sign up for gas station loyalty apps — Shell Fuel Rewards, Marathon MakeItCount, and Circle K Inner Circle all offer genuine per-gallon discounts that compound over time.
- Use a gas rewards credit card. The Costco Citi Visa earns 4% back on eligible gas; Blue Cash Preferred earns 3% at US gas stations. Pairing a reward card with a warehouse club maximizes savings.
- Avoid filling up at highway exits, airports, and tourist areas where convenience premiums routinely add 15-25 cents per gallon.
- Keep your tires properly inflated to the manufacturer's recommended PSI — under-inflated tires reduce fuel economy by up to 3%, costing you money every mile.
- Accelerate and brake gradually. Aggressive driving can reduce fuel economy by 15-40%, directly increasing how often you fill up.
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