How gas prices have changed in Decatur, Illinois in the last week

Written by:
May 18, 2026
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How gas prices have changed in Decatur, Illinois in the last week

compiled statistics on gas prices in Decatur, IL metro area using data from . Gas prices are current as of May 18.

Decatur, Illinois by the numbers
- Gas current price: $4.80
--- Illinois average: $5.05
- Week change: -$0.12 (-2.4%)
- Year change: +$1.56 (+47.9%)
- Historical expensive gas price: $5.07 (6/23/22)

- Diesel current price: $6.12
- Week change: +$0.12 (+2.1%)
- Year change: +$2.74 (+81.3%)
- Historical expensive diesel price: $6.20 (5/14/26)

Metros with the least expensive gas
#1. McAllen-Edinburg-Mission, TX: $3.78
#2. Brownsville-Harlingen, TX: $3.79
#3. Laredo, TX: $3.80

Read on to see which metros have the most expensive gas prices.

1 / 5
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#5. San Luis Obispo-Atascadero-Paso Robles, CA

- Regular gas price: $6.30
2 / 5
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#4. San Rafael, CA

- Regular gas price: $6.31
3 / 5
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#3. San Francisco, CA

- Regular gas price: $6.31
4 / 5
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#2. Salinas, CA

- Regular gas price: $6.31
5 / 5
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#1. Napa, CA

- Regular gas price: $6.37

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