How Regular vs Premium Fuel Cost Calculator Works?
This tool works by subtracting the regular octane price from the premium octane price and multiplying by the gallons you buy each year. The result is the yearly cost of choosing premium.
Enter the regular price
Type the price of 87-octane regular, for example $3.45 per gallon.
Enter the premium price
Type the price of 91 or 93-octane premium, for example $4.25 per gallon.
Enter annual gallons
Type the gallons bought per year. The default is 500 gallons (1,893 L).
Read the premium cost
The tool returns the extra yearly dollars spent on premium.
Regular vs Premium Fuel Cost Calculator Formula
The formula is Premium Cost = (Premium Price − Regular Price) × Annual Gallons.
Premium Cost = (Premium Price − Regular Price) × Annual GallonsFormula variables
- Premium Price − Regular Price
- Octane price gap per US gallon (3.785 L).
- Annual Gallons
- Fuel bought in 12 months.
Worked example
- Regular Octane Price: $3.45/gal
- Premium Octane Price: $4.25/gal
- Annual Gallons: 500 gal
- Price gap: $4.25 − $3.45 = $0.80 per gallon.
- Yearly cost: $0.80 × 500 = $400.00.
Result: $400.00 ($ premium octane cost)
Engines labeled "premium recommended" run on regular with a small performance loss, while engines labeled "premium required" need premium to avoid knock. Check the fuel door or owner's manual before switching grades.
Regular vs Premium Fuel Cost Calculator Conversion Table
The table shows the yearly premium cost for 3 fuel volumes at 3 premium prices, compared with regular at $3.45.
Rows: Annual Gallons (gal). Columns: Premium Octane Price ($/gal). Cells: $ premium octane cost.
| gal | $4.05/gal | $4.25/gal | $4.55/gal |
|---|---|---|---|
| 300 gal | $180.00 | $240.00 | $330.00 |
| 500 gal | $300.00 | $400.00 | $550.00 |
| 700 gal | $420.00 | $560.00 | $770.00 |
Values held constant: Regular Octane Price = $3.45/gal.
A driver buying 700 gallons (2,650 L) per year pays $770.00 extra when premium costs $4.55 and regular costs $3.45.
What is Regular vs Premium Fuel Cost Calculator?
The Regular vs Premium Fuel Cost Calculator is a tool that measures the yearly extra cost of buying premium gasoline instead of regular. The tool helps drivers decide which octane grade to buy.
Premium gasoline in the US often costs $0.70 to $1.00 more per gallon than regular. Over a year of driving, the gap adds up to hundreds of dollars.
Higher octane resists engine knock. Premium benefits only engines designed for it, and most cars built for regular gain nothing from premium.
What are the uses of Regular vs Premium Fuel Cost Calculator?
There are 4 main uses of the Regular vs Premium Fuel Cost Calculator: deciding on fuel grade, pricing a premium-required car purchase, checking fleet fuel policies, and budgeting for performance cars.
Deciding on fuel grade
Owners of "premium recommended" cars see what switching to regular saves.
Pricing a premium-required car purchase
Buyers add the yearly premium cost to the cost of ownership.
Checking fleet fuel policies
Fleet managers stop unneeded premium purchases.
Budgeting for performance cars
Sports car owners plan for the yearly premium surcharge.
Need every metric in one place? Open the main MPG Cost Calculator or browse all 101 fuel calculators.