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### Author Topic: "Miles per Gallon" versus "Gallons per Mile"  (Read 6587 times)

#### utilitarian

• Hero Member
• Posts: 816
##### "Miles per Gallon" versus "Gallons per Mile"
« on: July 03, 2008, 06:08:25 PM »
I have come to the conclusion that Gallons per Mile (GPM) is a superior notation to Miles per Gallon (MPG), because it makes clearer the true gas (and monetary) savings.  With MPG, things are a little obfuscated.

For example, most would think that switching from a car with 30MPG to one with 100MPG will save more money and more gas than switching from a car with 10MPG to one with 15MPG.  But this is not true.  The math:

10,000 miles at 10MPG = 1000 gallons, at \$4 per gallon would be \$4000
10,000 miles at 15MPG = 667 gallons, at \$4 per gallon would be \$2668
Savings of \$1332

10,000 miles at 30MPG = 333 gallons, at \$4 per gallon would be \$1332
10,000 miles at 100MPG = 100 gallons, at \$4 per gallon would be \$400
Savings of \$932

With GPM, there is no such confusion.

Going from 10MPG to 15MPG would be going from 0.100 GPM to 0.067 GPM, or a difference of .033 GPM
Going from 30MPG to 100MPG would be going from 0.033 GPM to .010 GPM, or a difference of .023 GPM