Miles per US gallon fuel economy unit.
Miles per US gallon to US gallons per 100 miles Converter — mpg to gal/100 mi
Convert Miles per US gallon (mpg) to US gallons per 100 miles (gal/100 mi) using the exact conversion factor (1 miles per us gallon = 100 us gallons per 100 miles). See the formula, worked examples, conversion table, history, and common uses.
Miles per US gallon to US gallons per 100 miles converter
Converter
Fuel Economy Converter
Convert MPG, km/L, L/100 km, and related transport fuel economy units.
Context values
Some unit families need one extra value for a physically accurate result.
US gallons per 100 miles fuel economy unit.
Normalize fuel economy to distance per volume, inverting consumption units when needed.
Fuel economy supports both distance-per-volume and volume-per-distance units.
Reserved above the conversion cards and below the converter.
About Converting Miles per US gallon to US gallons per 100 miles
Miles per US gallon and US gallons per 100 miles are two of the ways the world measures fuel efficiency, and converting between them is essential for comparing a US car's window-sticker rating to a European or Asian one. Miles per US gallon is most often used for us epa fuel economy window stickers on new vehicles.
Formula
Fuel economy formulas invert between distance-per-volume and volume-per-distance units as needed.
Efficiency-style units (like mpg or km/L) and consumption-style units (like L/100 km) measure the same underlying thing from opposite directions, so converting between the two families requires a reciprocal, not just a multiplication factor.
Simple example
1 mpg × 1.807472e+13 = 100 gal/100 mi
1 miles per us gallon = 100 us gallons per 100 miles.
Real-world example
30 mpg × 1.807472e+13 = 3.333333333 gal/100 mi
30 miles per us gallon = 3.333333333 us gallons per 100 miles.
Conversion table
| Miles per US gallon (mpg) | US gallons per 100 miles (gal/100 mi) |
|---|---|
| 10 mpg | 10 gal/100 mi |
| 20 mpg | 5 gal/100 mi |
| 30 mpg | 3.333333333 gal/100 mi |
| 40 mpg | 2.5 gal/100 mi |
| 50 mpg | 2 gal/100 mi |
| 60 mpg | 1.666666667 gal/100 mi |
Reverse conversion: US gallons per 100 miles to Miles per US gallon
100 gal/100 mi × 5.53259e-14 = 1 mpg
100 us gallons per 100 miles = 1 miles per us gallon.
Fuel economy formulas invert between distance-per-volume and volume-per-distance units as needed.
For a page dedicated to this direction, see US gallons per 100 miles to Miles per US gallon.
Understanding the Miles per US gallon
Miles per US gallon (mpg) measures fuel economy. Miles per US gallon measures distance traveled per US gallon of fuel consumed — higher values mean better efficiency. It is classified as a US customary unit.
Where it's used: United States (vehicle fuel-economy ratings and labeling)
Uses of the Miles per US gallon today
- US EPA fuel economy window stickers on new vehicles
- Everyday US driver fuel-cost estimation
History of the Miles per US gallon
MPG became the standard US fuel-economy metric alongside the rise of mass automobile ownership in the 20th century, with the EPA establishing standardized testing and labeling requirements starting in the 1970s following the 1973 oil crisis.
Historical origin. Miles per US gallon was not the invention of a single named person; it developed through the process described above.
Understanding the US gallons per 100 miles (gal/100 mi)
US gallons per 100 miles fuel economy unit.
Miles per US gallon — sources
- US EPA — Fuel Economy Testing — Describes the standardized MPG testing and labeling process.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many us gallons per 100 miles are in 1 miles per us gallon?
1 miles per us gallon equals 100 us gallons per 100 miles, using the exact defined conversion factor rather than an estimate.
How do I convert miles per us gallon to us gallons per 100 miles?
Fuel economy units sometimes need inversion rather than simple multiplication — the converter above and the formula section handle this automatically.
How do I convert us gallons per 100 miles back to miles per us gallon?
Use the reverse factor: 1 us gallons per 100 miles equals 100 miles per us gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a miles per us gallon?
Miles per US gallon (mpg) measures fuel economy. Miles per US gallon measures distance traveled per US gallon of fuel consumed — higher values mean better efficiency. It is classified as a US customary unit.
What is a us gallons per 100 miles?
US gallons per 100 miles (gal/100 mi) is a unit of fuel economy.
Is the miles per us gallon to us gallons per 100 miles conversion exact?
Yes. Both miles per us gallon and us gallons per 100 miles are defined by fixed standards rather than physical artifacts, so the factor of 1.807472e+13 used above is exact to as many digits as you choose to display.
Where is the miles per us gallon still used today?
United States (vehicle fuel-economy ratings and labeling)