Depends. I think for most pre-hyperbitcoinization Bitcoiners it's like a 2010 Toyota Carolla, or American HODL's moped. If you need to haul stuff then maybe an old pickup truck.
If GM had to make the best new car for Bitcoiners now, they would first have to stop begging from the government and start participating in the open market like the rest of us.
Maybe if there is a trade-off between emissions and efficiency, they could increase emissions.