Miles per Gallon UK (mpg UK) to Gallons US per 100 Miles (gal US/100 mi)

Miles per Gallon UK (mpg UK) to Gallons US per 100 Miles (gal US/100 mi) conversion

Use the Miles per Gallon UK (mpg UK) to Gallons US per 100 Miles (gal US/100 mi) converter to compare vehicle figures reported in different fuel units. Enter a positive value, choose a precision from 0 to 12 decimal places, and select Submit. Read the output with its complete destination label. Distance per unit of fuel and fuel per unit of distance run in opposite directions. Higher economy corresponds to lower consumption.

Formula and direction

output = 120.094993 ÷ input. This factor is rounded here for readability; retain the underlying unit definitions for further calculations. This is a reciprocal conversion: doubling the source value halves the destination value. A fixed multiplier alone is incorrect.

Worked examples

A value of 10 mpg UK converts to approximately 12.009499 gal US/100 mi. A value of 20 mpg UK converts to approximately 6.00475 gal US/100 mi. These are unit conversion examples, not estimates of what a particular vehicle will achieve.

Keep gallon definitions consistent

Use the U.S. liquid gallon, which is 3.785411784 liters, for any US label. Use the Imperial gallon, which is 4.54609 liters, for any UK label. These are different volume units, so an unlabeled mpg figure is ambiguous.

Frequently asked questions

Can I enter zero?

This converter requires a positive input and rejects zero or negative values. A reciprocal calculation divides by the input, so zero has no finite converted result. Use a positive measured value for fuel comparisons.

Does converting make two vehicle tests comparable?

It puts their units on the same basis. It does not remove differences in speed, route, weather, driving style, or test procedure. Keep those conditions in mind when comparing the converted figures.

Related converters

Fuel economy converter tools | Gallons US per 100 Miles (gal US/100 mi) to Miles per Gallon UK (mpg UK) | Miles per Gallon UK (mpg UK) to Liters per 100 Kilometers (L/100 km) | Miles per Gallon UK (mpg UK) to Kilometers per Liter (km/L)