@uthredii
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Reasons for this could be:

  1. low average number of passenegers
  2. buses have old inefficient engines because of underfunding/underinvestment
bruhbeans
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it’s also much easier for a city to electrify its bus fleet, vs convincing private citizens to go electric with their personal cars.

bruhbeans
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I’m curious how/where this data comes from, seems like it would vary a lot, e.g. Seattle and SF have some electric busses using catenary wires, Chicago has diesel-electric hybrids, Bogotá has dedicated lanes so busses aren’t sitting in traffic, etc. Different cities will have different mode share, too, so some systems will have more riders. In Chicago, the train system is distributes inequitably, leading to a higher mode share for the train in wealthy areas and a higher mode share for the bus in poorer areas.

@DPUGT2
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No one’s designing specialty engines for buses. They just pick a model from their catalog(s) that is within specs, and most of those are seeing the same kinds of efficiency gains as other internal combustion engines.

If anything, they’re somewhat exempt from the higher emissions standards of cars, so they might actually be more efficient, passenger-mile-per-gallon. Or at least, that would be my first guess.

@oriond
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Bicycle travel beats all others, I was expecting yo see it on the graph.

It does not even polute (bc it’s based) so I think that it’s not there because that.

@ziproot
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The emissions by bicycle are dependent on how you get your food. EDIT: This is what I mean

@AgreeableLandscape
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More surprised about how low emissions ferries are per passenger. Especially that it beats out trains.

@pingveno
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Maybe trains are using inefficient engines? Eurostar performs quite admirably.

@AgreeableLandscape
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Eurostar is electric. Then again, aren’t most trains in the UK?

@ster
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Some are, lots aren’t.

@Belaptir
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I guess it depends on the country. Train is known to be one of the cleanest ways of transportation, but I’ve seen diesel locomotives in certain areas where it’s hard to install an electric infrastructure and I don’t think they could be considered “clean”.

In a similar way, city buses here are either hybrid, electric or work with methane, making them relatively clean, but for long trips, they use diesel ones, and depending on how old are those buses, they could be pretty high emissions-wise.

@pingveno
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But on the other other hand, having a bus available - whether it’s full or not - makes it more viable for people to live a car free lifestyle, which in turn makes them less likely to use a car, which in turn leads to higher bus use. Or so the story goes.

@sexy_peach@feddit.de
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I vaguely remember that a travel bus takes like 14-20liters per 100km or something like this which makes it extremely low per passenger

@leanleft
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does anyone have an alternative source to validate this?

mekhos
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No, but here is two similar charts from UK and Australia

@sexy_peach@feddit.de
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Aha, the australian one seems to have better numbers for buses

mekhos
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Terrain and altitude of the area studied could affect these numbers as could age and maintenance state of the fleet.

@Yujiri
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Nitpick, but imagine making a color coded graph and choosing 3 shades of the same color :)

@sexy_peach@feddit.de
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Honestly the whole thing seems pretty stupid, other sources have numbers that seem more sensible. This is the first I found ;)

Trains and metropolitan trains (metro & rail buses) are amazing transports but sadly ppl keep insisting on cars…

@ezmack
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Surprised motorcycles aren’t better. Even driving like a lunatic mine got great gas mileage

@sexy_peach@feddit.de
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There’s motorcycles out there that use as much gas as normal cars

@pingveno
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It’s worth noting this is the grams per passenger-kilometer cost. The most efficient kilometer is the kilometer you don’t take, so a plane trip to a nearby vacation spot is going to be less efficient per-kilometer than going around the world, but much more efficient overall.

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