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Comment on Murica

SoleInvictus@lemmy.blahaj.zone ⁨8⁩ ⁨hours⁩ ago

Humans are actually unusually energy efficient for mammals when walking and even more so when cycling. Here’s a little info graphic showing a breakdown.

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One thing to keep in mind if you have a dog is they’re less energy efficient than humans. While dogs can run faster, a reasonably fit human can easily out distance an equally fit dog when walking or distance running.

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milicent_bystandr@lemm.ee ⁨4⁩ ⁨hours⁩ ago
Also, I love the units. Using miles on one axis and km on the other.

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milicent_bystandr@lemm.ee ⁨4⁩ ⁨hours⁩ ago
This is very useful. My four friends and I will have to stop swimming to work, and take the car instead.

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TDCN@feddit.dk ⁨7⁩ ⁨hours⁩ ago
Nice graphic. But it seems like it doesn’t factor in kg of mass moved. A human and a bike is a lot lighter than a car or a horse. You could also argue that the vehicle weigh should be ignored but then again you could easily argue back that weight of goods move can possibly be a lot higher with a car if you load it up to capacity.

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- SoleInvictus@lemmy.blahaj.zone ⁨6⁩ ⁨hours⁩ ago
  I’m back with better data. I’m assuming the travel path is perfectly flat because I don’t feel like modeling elevation changes. I’m being energy efficient (read: lazy).
  
  For cycling, I’m using the global average human weight of 62 kg, assuming the cycle is 8 kg, and the pace is 10 kph, which is pretty relaxed.
  
  For walking, I’m using the 62 kg person walking at 4 kph.
  
  For driving with petrol, we’ll use the same spherical 62 kg human and a 2024 Toyota Prius with a fuel efficiency of 4.8 L/100 km and a mass of 1570 kg. One liter of petrol is approximately 8174 kcal. Double the energy expenditure for an estimate for your typical SUV.
  
  For electric, I chose a 2024 Hyundai Ioniq 5 N with an energy efficiency of 21.2 kWh/100km and a mass of 2235 kg. One kilowatt-hour is approximately 860 kcal.
  
  Walking: 0.74 kcal•km^-1^•kg^-1^
  Cycling: 0.34 kcal•km^-1^•kg^-1^
  Driving(p): 0.24 kcal•km^-1^•kg^-1^
  Driving(e): 0.08 kcal•km^-1^•kg^-1^
  
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  - TDCN@feddit.dk ⁨1⁩ ⁨hour⁩ ago
    Oh really. It seems to contradict the graphics. Cars are also stupid efficient now. I also ran Dom quick calculations on my electric bike and it is crazy how many km*kWh⁻¹ you get and how little it cost to run.
    
    I’ve heard about some research showing that an electric bike over it’s entire lifetime is more environmentally friendly than a traditional one because the amount of extra food you need to consume without the electric help is over time more co2 than the co2 it costs to charge the battery. I don’t know where the research is from since I just heard it from a colleague so don’t quote me on it, but electric motors are really efficient so it sounds very plausible to me.
    
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  - null_dot@lemmy.dbzer0.com ⁨2⁩ ⁨hours⁩ ago
    Wait so cars are more efficient than cycling now ?
    
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    endeavor@sopuli.xyz ⁨33⁩ ⁨minutes⁩ ago
    Seems so. Even cheating it in favor of the bikes. But looking at electric car numbers it should make ebikes even more effecient.
    
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- SoleInvictus@lemmy.blahaj.zone ⁨7⁩ ⁨hours⁩ ago
  It still doesn’t give us kcal•km^-1^•kg^-1^, which is what I was looking for. We could do some math to get us some loose estimates, though. I’ll do exactly that and report back shortly.
  
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