this post was submitted on 13 Nov 2025
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[–] kokesh@lemmy.world -3 points 6 days ago (2 children)

Ok, I would have to drive in lower gear. That means using more power, higher RPM. Hence higher consumption.

[–] richardwonka@mas.to -3 points 6 days ago

@kokesh at this point you could save some face and not comment any more. You are presenting yourself as an uniformed fool who doesn’t recognise reality.

[–] ZkhqrD5o@lemmy.world -1 points 6 days ago (1 children)

Um, no not really. The gearbox only exists because the engine can only go so fast. The tyres can spin way faster than the engine. For example, you could take your foot entirely off the throttle and still drive 70 in sixth gear while the engine essentially idles. On the other side of the spectrum, the slowest the car can go, while having full contact with the gearbox would be 8 kmh, give or take. So, in the middle of the spectrum you could drive about 30kmh with 3rd gear fully clutched in and the engine on idle. Slower is also possible, naturally. Most cities choose 30 kilometres an hour because that's when road deaths sharply increase. The reason for this is complex, but one of the main reasons is the field of view. The faster a car goes, the smaller your field of vision becomes. You can clearly see the pavement on your side, the other side of the road, and even some of the pavement of the opposite side. When driving 50, however, you can basically only see your own pavement and some of the opposite road. When doing 130 you can essentially only see your own lane well, with rudimentary details in the other adjacent lanes.

[–] Omgpwnies@lemmy.world 5 points 6 days ago

The gearbox only exists because the engine can only go so fast.

Oversimplified. The transmission exists because engines are optimally efficient at specific RPM ranges and the transmission works to keep the engine in those ranges. It/you (auto vs stick) will also downshift to provide more power at the cost of efficiency if hard acceleration is required.

When doing 130 you can essentially only see your own lane well, with rudimentary details in the other adjacent lanes

If you can't see adjacent lanes, then you're not scanning properly. This is called tunnel vision and where I live you'll fail a road test for it. You'd also fail for going 130km/h.