cross-posted from: https://slrpnk.net/post/7273195
Not trying to be that guy, but do the bike and walking numbers include the energy from the calories you eat, or the energy needed to produce that food?
I wondered that too. I imagine it would be very inaccurate to include that as the amount of calories needed would vary wildly person to person. For example, I burned around 2000kcal to cycle 100km in hilly terrain at the weekend, while a friend burned roughly twice that on the same ride.
You can make anything look bad by removing the next bad comparison though. Like if a pickup truck were there, everything would look good. Remove the car and add a scooter, windsurfing, rollerblading, and rolling downhill, and the e-bike looks bad.
Not really. The F150 Lightning’s efficiency is ~270Wh/km city which means a small EV is only a 50% improvement vs 95% for ebike.
Also, this graph is helpful given our current situation. Maybe once we’re mostly at the 95% better than an F150 Lightning solution (e-bikes), it might be worth being concerned with energy efficiency, but we’re not there.
I really like this graph because it helps visualizes scale. Sometimes, people knock e-bikes by saying they are less efficient than acoustic bikes. While that may be true, it’s another example of, “Don’t let perfect be the enemy of good.” As shown here, e-bikes are literally the 90% solution. I really don’t think it’s worth sweating the potential energy efficiency differences between e-bikes and acoustic bikes. What’s really important is reducing car usage.
Acoustic bikes? I think analog may be more fitting here but honestly I’m not sure. I’ve just never heard acoustic referenced outside of sound.
Acoustic is funnier than analog, and I’m not sure if it’s any less accurate than analog. In analog clocks, the passage of time is represented in an analogous rotation of clock hands. In analog sound, the change in voltage on a wire is analogous to the pressure waves you hear as sound. I don’t know what is analogous to what in biking.
Also, the opposite of analog is digital, and ebikes are not digital bikes.
I’m pretty sure E-bikes are digitally controlled.
Acoustic is definitely funnier, but all definitions I can find about it relate to sound.
Fuck cars, but was it really necessary to compare at such different speeds? Air resistance is a big factor and a proper electric bike can go 45kmh as well. Or the car can drive 25kmh
a proper electric bike can go 45kmh as well.
There’s some debate about that. E-bicycles above class 2 (with assistance/drive at over 20mph) are not allowed on a lot of bike lanes, so they’re more like electric mopeds
Yes, they are handled differently in a legal sense. This comes with some small changes to usability of e.g. bike lanes, but in terms of practicality it’s basically still a bike.
Would still be a better comparison, since this is focused on energy consumption. Or just have the car drive slower, as per my other suggestion.
The different speeds are to make sure the graph pushes the agenda of the creator. All of them going the same speed would decrease the disparity between walking and driving.
You got lies, damn lies and statistics.
And this is one of those.
It wouldn’t change that much actually. Modern cars are really aerodynamic and the comparatively high weight of electric cars emphasizes the rolling resistance in relation to the air resistance.
This Wikipedia page (https://de.wikipedia.org/wiki/Fahrwiderstand) has an example where 77% of energy goes to air resistance, 23% to rolling resistance - At a speed of 200kmh. Which means rolling resistance requires 5x more energy to overcome than air resistance at 50kmh. (77% -> 77 energy units -> multiply by (50/200)^2 = 1/16, as air resistance depends on speed squared -> 5 energy units, but rolling resistance is independent of speed so it doesn’t change (still 23 energy units))
The fact remains that cars are faster than bikes. Driving a car usually means going faster and hence wasting more energy. Sure, plenty of people deal with distances that necessitate such speeds to be practical in daily life, but that’s a different problem to be solved.
