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Murica
(lemmy.ml)
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this post was submitted on 23 Feb 2025
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Someone can probably do the math, but i have a hunch that humans are technically not very fuel efficient if you look at calories burned pr the total mass being moved along.
But whatever it is biking is awesome, but being technically correct is even better.
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.
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.
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~~. Ignore that. I did not see it said 5 riders for the car
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^
It still doesn't give us kcal•km^-1^•kg^-1^ (or an equivalent), 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.
I feel like 'total mass being moved' is irrelevent if most of that mass is useless (car motor/metal frame/plastic/etc).
Even if a car motor was more efficient per kg, most of the work is wasted on moving the actual car itself, regardless of the passengers & cargo.
Bikes clearly use less energy to displace 'useful mass' than a car, so they are more efficient in that sense.
Quick math shows I am quite a bit more efficient than a Nissan Juke traveling 150 miles at 19mph. About 50kcal/pound for the car and 8kcal/pound for me+bike to travel the distance.