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this post was submitted on 17 Nov 2023
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I did the math once for my own commute, on my e-bike and with my electric car, and found that while the electric car uses only 20% of the energy that an average gas-powered car would, the bike uses just 1%. My bike, on my route (both directions averaged together) got 2,200 mpge.
Miles per gallon energy? What's that abbreviation?
Just another example of how Americans will use anything but metric (we do use metric sometimes, I know, it’s just a meme). We could easily measure it in Wh/km, but then we would also have to change how we measure gasoline cars if we want people to make direct comparisons. But, since we sell gas by the gallon, we would also have to change how gas is sold. When the EPA first came up with mpge I thought it was stupid (we don’t buy electricity by the gallon!), but I’ve come around to the convenience of being able to easily compare the two types of fuel. The EPA assumes 1 gallon of gas to contain 33.7 kWh of energy.
Maybe we should get everyone to switch to Joules for measuring, buying, and selling gasoline and electricity?
It's a pretty flawed comparison, though. It assumes a certain amount of fossil fuels being burned at the power plant that's feeding your electric car. That's a number that varies a lot between regions, and is bound to change as more and more renewables are spun up. Putting solar panels on your home throws the whole comparison out. It's nearly useless.
Isn't the point for the consumer to measure their cost? Not the overall efficiency of the production and distribution for each source of fuel?
Like I buy X gallons per month of gas because my car gets 20 mpg and I dive Y miles. If this electric car uses Z amount of electricity and I still drive Y miles, I'll save ß dollars.
It is not really possible for the consumer to calculate their respective mpge, since your specific utlities power mix will differ region by region.
That's the idea, but it doesn't actually do that. Even if it did, the cost would be variable by region, so it's still imperfect.
To be fair, even in metric countries in Europe, they use imperial occasionally. This is the case for wheel sizes and display sizes, both usually measured in inches.
Don't tell them. Once you start looking for exceptions to "use metric for everything", you'll find one in every country, and people get really angry when you point this out. As if not being 100% metric is some kind of moral failing.
Car tire sizing is a bizarre, design-by-committee thing, though. Diameter is in inches, width is in mm, and sidewall width is a percentage of the width. Why?
You're using kWh instead of Joules in your comment. :P
Joules represent a very small amount of energy. We probably want kWh or kJ. Although, I think just places in the US already use kWh for electricity?
It's not complicated. Mpge allows you to compare energy efficiency vs internal combustion cars. They also provide kWh/100 mi, which allows you to calculate actual cost of operation, depending on how much you pay for a kWh.
The E is for Equivalent. It's how "fuel" efficiency is discussed when referring to non liquid fuel vehicles.
Gotcha, thanks.
Yup. There’s a Wikipedia page listing all the modes of transportation and their efficiency. Electric bikes are just about the most energy efficient way to transport humans.
https://en.m.wikipedia.org/wiki/Energy_efficiency_in_transport
This is a weird definition they're using, and it doesn't encompass the whole box. An electric vehicle might be more efficient on a distance per unit energy basis, but it's less efficient on a total energy basis because we lose some of the energy in the electrification.