Cars & VehiclesMulti-Fuel Tank
Fuel Cost Calculator
Calculate fuel fill-up costs, cruising range per tank, and cost per 100 miles across Regular, Midgrade, Premium, Diesel, and Flex-Fuel E85.
Calculation Results
Fuel Fill-Up & Cruising Range Formula
Fill-Up Cost = Tank Capacity × (1 − Current Fuel Level %) × Price per Gallon- Full Tank Cruising Range = Tank Capacity (Gallons) × Vehicle Combined MPG.
- Cost per 100 Miles = (100 / MPG) × Price per Gallon.
Step-by-Step Worked Example
Scenario: Filling an empty 16.5-gallon tank (20% remaining) with Premium fuel at $4.25/gal at 26 MPG
Calculation Steps:
- Gallons Needed to Fill = 16.5 × (1 − 0.20) = 13.2 gallons
- Total Fill-Up Cost = 13.2 gallons × $4.25 = $56.10
- Full Tank Range = 16.5 gallons × 26 MPG = 429 miles
- Cost per 100 Miles = (100 / 26) × $4.25 = $16.35
Result: Filling the tank costs $56.10. A full tank delivers 429 miles of range at $16.35 per 100 miles.
How to Use This Calculator
- 1Select your fuel type (Regular 87, Midgrade 89, Premium 91-93, Diesel, or E85).
- 2Enter your fuel tank capacity in gallons and approximate gauge level.
- 3Input the pump price and your vehicle’s average MPG.
Assumptions & Limitations
- Assumes the tank is filled to the automatic pump shutoff level.
Frequently Asked Questions
Does my car really need Premium fuel?
Check your owner’s manual or fuel door. If it says "Premium Required", using lower octane can cause engine knocking and reduce power. If it says "Premium Recommended", your engine will safely run on Regular 87 with a slight decrease in peak performance.
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