You are right of course about the tuk-tuk not cruising at 90 kph. I used that because consumption at that speed is about the only figure I can be confident of

You are right of course about the tuk-tuk not cruising at 90 kph. I used that because consumption at that speed is about the only figure I can be confident of regarding the Tesla; it's hard to find a road where I can travel the requisite 10 km at 22 kph to get a good consumption reading. Perhaps I'll give it a try if I can find a place to do it, I read somewhere that someone did an economy run in a Model S and got a thousand km range at something like 30 kph. I think that the Tesla probably benefits from an economy of scale both in manufacturing volume and advanced motor and inverter design. According to our favourite search engine tuk-tuks weigh between 250 and 450 kg so with driver and passenger the smaller ones are about one sixth the mass of my car, the bigger ones a bit over a quarter. The small motor in the tuk-tuk is probably much less efficient than the Tesla motor even in the middle of its power range. Also I doubt that the tuk-tuk would have especially effective regenerative breaking because doing this automatically requires coordination with the mechanical brakes. I'm pretty confident that no vehicle in the tuk-tuk weight class other than some specially designed research vehicle will travel a kilometre on only 17 Whr, certainly not one carrying passengers. The losses will be dominated by rolling resistance. Or did I misinterpret your factor of ten? For comparison an electric scooter with a 36 V, 7.5 Ah battery has a range of 25 km, that's 10.8 Wh/km. See https://stayclassy.no/collections/el-sparkesykkel/products/classywalk-s50-n-elektrisk-sparkesykkel https://stayclassy.no/collections/el-sparkesykkel/products/c... Anyway, none of this is meant to detract from the achievement of the guy with the solar powered tuk-tuk. P.s. not that it makes any real difference but the roads are Norwegian not US. :-)