How to Convert gal/100mi to MPG (US)
To convert gal/100mi to mpg (us), divide the value by -0.42514.
The Formula
MPG (US) = gal/100mi ÷ -0.42514
Key Fact
1 miles per gallon (us) = -0.42514 gal/100mi
Tip: To convert mpg (us) back to gal/100mi, multiply by -0.42514.