Diesel Fuel Prices in St. Louis, MO

Updated April 5, 2026 — Prices updated regularly from EIA data

$3.94

Diesel Fuel (N/A octane) per gallon

About Diesel Fuel in St. Louis

Commercial and passenger diesel users in St. Louis pay $$3.94 per gallon. Diesel's energy content — about 10-15% more BTU per gallon than gasoline — means more miles per gallon even before accounting for engine efficiency advantages.

When to Use Diesel Fuel

Best for: commercial and towing

Vehicle types: diesel trucks and commercial vehicles

Fuel Price Comparison in St. Louis

Fuel TypePricevs. Diesel FuelOctane
Regular Unleaded$2.91$-1.0387
Premium Gasoline$3.63$-0.3191-93
Diesel Fuel THIS PAGE$3.94—N/A

Diesel Fuel in Nearby Cities

Springfield$4.52
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Frequently Asked Questions

In St. Louis, Diesel Fuel is priced at $$3.94 per gallon versus ${regularPrice} for regular — a ${diff} per gallon premium. On a 15-gallon fill-up, that's ${fillDiff} extra. Over 50 annual fill-ups, the premium adds ${annualDiff} to your fuel costs.
If your car requires premium and you accidentally fill with regular, modern engines have knock sensors that retard timing to prevent damage. You may notice reduced performance and slightly worse fuel economy. Fill with premium on your next fill-up. This is a minor issue if it happens occasionally.
Follow your owner's manual recommendation regardless of whether the car is new. Engine break-in does not require a specific fuel grade. Use what the manufacturer specifies from day one.
Vehicles requiring Diesel Fuel typically include diesel trucks and commercial vehicles. Your owner's manual and the label inside your fuel door specify the required grade. Using a lower octane than required can cause engine knock and reduce performance over time.

Related Gas Price Pages

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