Electric Vehicles

With current technology yes it’s impossible, although those doughnut motors are next level, so you are spot on with tweaking the definition of efficiency. Things we can do now are as you mentioned wind resistance, Lucid have achieved over 5mi/kWh in a large luxury vehicle focusing on that.

You can focus on rolling resistance of the tyres, or my making an ultra-efficient smooth self-driving system.

Next is weight, making the car and batteries as light as possible. Although this would reduce the regenerative braking, the inefficiencies in that system would also be reduced.

Ancillary power, most cars have reasonably efficient heat-pump and electrical systems but shaving a few milliwatts from each system and cutting out a few truly unneeded systems will cut down on wasted power and weight. I like the Ami and it’s, ‘you already have a screen, entertainment system, and sat nav on your phone’ philosophy.

Now we get to the tweaking of the efficiency definition… how about we say you can have as many kWh as you like as long as it’s no bigger and no heavier than the origin leaf 22kWh pack?

Maybe adding solar or other micro-generation with an assumption on % of day/night driving and average power achieved by micro generation.