Regular Unleaded Prices in Great Falls, MT

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

$3.18

Regular Unleaded (87 octane) per gallon

About Regular Unleaded in Great Falls

Today's regular gas price in Great Falls, Montana is $$3.18 per gallon. Regular 87-octane is the default choice for most American cars, trucks, and SUVs. If your owner's manual says 87 or regular, this is your grade.

When to Use Regular Unleaded

Best for: everyday driving

Vehicle types: most cars and trucks

Fuel Price Comparison in Great Falls

Fuel TypePricevs. Regular UnleadedOctane
Regular Unleaded THIS PAGE$3.18—87
Premium Gasoline$3.97+$0.7991-93
Diesel Fuel$4.30+$1.12N/A

Regular Unleaded in Nearby Cities

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Frequently Asked Questions

National Regular Unleaded prices average ${natPrice} per gallon. Great Falls's current price of $$3.18 is {comparison} the national average. Regional refinery access and state tax differences drive most of the variation.
TOP TIER certification means the fuel exceeds EPA minimum detergency standards. Studies suggest TOP TIER fuels meaningfully reduce engine deposits vs. minimum-standard fuels. Most major brands (Shell, Chevron, BP, Costco) are TOP TIER certified.
Mixing grades is generally fine in practice — your engine's knock sensors will adjust timing accordingly. If your vehicle requires premium and you add some regular, no immediate damage occurs. Consistently running below the required octane in a performance engine is not recommended long-term.
{octaneInfo} Octane rating measures a fuel's resistance to premature ignition (knock). Standard regular is 87, mid-grade is 89-90, and premium is 91-93 in the United States.

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