Ever wondered how much gasoline it takes you to walk a mile?

At rest over 24 hours, your body uses about 1,522 calories.
Every hour of the day you use about 63 calories.
It takes 3.4 times your resting calorie rate to walk at 3.1MPH;
so, every hour you walk you use about 214 calories.
Which means that for every mile you walk you use about 69 calories.
For omnivores, it takes 10 calories of fossil fuel to create every calorie you eat.
So to walk a mile you use 690 fossil fuel calories.
There are 30,400 calories in a gallon of gas.
So, **your HumanMPG is 44.1**.

Your MPG is better than the average car from 2016 which gets 24.7MPG; so **it's probably better for the environment for you to walk**.

With this calculator, we're ignoring the fossil fuel expenditure involved in making a car, refining fuel, and driving the car. For an average car including these total cost of ownership numbers means that cars use about 20% more fossil fuel per mile than you would otherwise estimate using miles per gallon:

- A car takes about 8,126,195 calories to build. Modern cars last about 200,000 miles. 8,126,195calories / 200,000miles =
**41 calories**. - It's estimated to take 6kWh (5159 calories) to refine crude oil into a gallon of gasoline. That means for every mile an average car uses an additional 5159 calories / 24.7 miles per gallon =
**209 calories**. - The average speed of driving in the US is 32MPH. 60 minutes in an hour / 32 MPH = 1.9 minutes per mile. It takes about twice your basal metabolic rate to drive. The average person in the US has a basal metabolic rate of about 1605 calories per day. In the time it takes to drive a mile most people burn about (1605BMR *(1.9 minutes/(24 hours * 60 minutes)))*2 =
**4.25 calories**.

The calculator uses a lot of assumptions about statistically average cars and people. Here are a few things that we should think about:

- How accurate is the 10:1 fossil fuel calories to food calories? How about 5:1 for vegetarians?
- How much energy does it take to make & maintain roads?
- If you only take into account farming the ratio is 3:1. Processing, cooking, transport, packaging, etc make up the rest. Should we account for that?
- Is Metabolic Equivalent accurate?
- How accurate is the basal metabolic rate (BMR) calculation? Should it be gendered? What age and weight ranges is the BMR formula valid for?
- Does walking decrease the need for healthcare? How calorically valuable is health?
- Car crashes killed 40,200 people in 2016. If more people walked there would probably be fewer people driving.
- Is a car's consumption of a calorie more or less polluting than a calorie produced for people?
- Packaging contributes some fossil fuel calories to food, but it reduces spoilage. Is it better to have more packaging or less?

`"Gas Kcal"/((((((10*"Weight") + (6.25*"Height") - (5*"Age") + "Sex")/24)*"METS")/"Speed")*"Fossil Ratio")`

Formula | Item | Value |
---|---|---|

Gas Kcal | Kcal per Gallon of Gas | 30,400 |

Weight | Your Weight | 182 |

Height | Your Height | 5' 6" |

Age | Your Age | 38 |

Sex | Your Sex | female use -161; male use 5 |

METS | Metabolic Equivalent | 3.37 (see lookup table) |

Speed | Your Speed | 3.1 |

Fossil Ratio | Fossil Fuel Ratio | omnivores use 10; vegetarians use 5 |