How MPG to Gallons per 100 Miles Converter Works?
This tool works by dividing 100 by the miles per gallon (MPG) figure. The result is the gallons a vehicle burns every 100 miles (161 km).
Enter the US MPG
Type the fuel economy, for example 25 MPG.
Apply the 100-mile base
The tool divides 100 by MPG.
Read gallons per 100 miles
The tool returns fuel used per 100 miles.
Compare vehicles
Lower gallons per 100 miles means lower fuel use.
MPG to Gallons per 100 Miles Converter Formula
The formula is Gallons per 100 Miles = 100 ÷ MPG.
Gallons per 100 mi = 100 ÷ MPGFormula variables
- 100
- Fixed distance base in miles.
- MPG
- Miles per US gallon.
Worked example
- US MPG: 25 MPG
- Divide 100 by 25: 100 ÷ 25 = 4.00 gallons per 100 miles (15.1 L).
Result: 4.00 (gal / 100 mi)
Gallons per 100 miles shows fuel savings in a straight line. Moving from 10 to 20 MPG saves 5 gallons per 100 miles, while moving from 25 to 50 MPG saves only 2 gallons.
MPG to Gallons per 100 Miles Converter Conversion Table
The table lists gallons per 100 miles for 7 common MPG ratings.
| US MPG (MPG) | Result (gal / 100 mi) |
|---|---|
| 10 MPG | 10.00 |
| 15 MPG | 6.67 |
| 20 MPG | 5.00 |
| 25 MPG | 4.00 |
| 30 MPG | 3.33 |
| 40 MPG | 2.50 |
| 50 MPG | 2.00 |
A 10 MPG truck burns 10 gallons (37.9 L) every 100 miles, 5 times the 2 gallons a 50 MPG hybrid burns.
What is MPG to Gallons per 100 Miles Converter?
The MPG to Gallons per 100 Miles Converter is a tool that converts miles per gallon into gallons used per 100 miles. The tool presents fuel use the way the EPA label does.
MPG makes efficiency gains look larger at the high end of the scale. Gallons per 100 miles shows the real fuel saved, which helps buyers avoid the "MPG illusion" described by Duke University researchers in 2008.
US window stickers have printed gallons per 100 miles next to MPG since the 2013 model year.
What are the uses of MPG to Gallons per 100 Miles Converter?
There are 4 main uses of the MPG to Gallons per 100 Miles Converter: comparing vehicle upgrades, reading EPA labels, planning fuel for set distances, and teaching fuel economy math.
Comparing vehicle upgrades
Buyers see real fuel saved when replacing a low-MPG vehicle.
Reading EPA labels
Shoppers match the label's gallons per 100 miles figure.
Planning fuel for set distances
Drivers scale gallons per 100 miles to trip length.
Teaching fuel economy math
Teachers show why MPG gains are not equal.
Need every metric in one place? Open the main MPG Cost Calculator or browse all 101 fuel calculators.