What feedback can the vehicle give the user about its operating efficiency, and what instrumentation is needed to measure it? I think reliability should also factor in because failing parts have their own environmental cost.
Vehicle skin friction
Windscreen dirt sensor (Camera)
Vehicle Weight
Suspension load cell (Load Cell)
Rolling Resistance
Tyre Pressure (Wireless TPMS)
Drivetrain losses (Travel vs theoretical)
Wheel alignment sensor (ultrasonic? Accelerometer?)
Bearing/CV issues audible sensor (microphone)
Wind speed and direction (ultrasonic array)
Fleet reliability
MTBF data correlated (Fleet data connection)
Driving styles
Cornering speeds (Accelerometer)
Throttle position (Digital)
Cabin vibration/impulse (Acclerometer)
Ambient Temperature (shielded rtd)
Max/min battery levels (Digital)
Parked in Sun/Shelter (PV Cell)
Tyre degradation / tread depth (laser, ultrasonic, accelerometer inferred)
Brake degradation (digitally inferred, ?)
Auxiliary energy use
Entertainment system (Digital)
Climate controls (Digital)
Other (Digital)
Aptera should make transparent the equivalent CO2 costs for their vehicle production and individual parts. This should include the CO2 cost of the production facilities as an overhead aggregated across their produced vehicles. On their website I think they should show the best estimates of per-capita CO2 targets required to avert climate disaster and demonstrate how their mode of transport fits into this puzzle. This would create meaningful segregation from vehicles like Tesla. Their design choices should also follow this philosophy, repair-ability and upgrade-ability being two big ones.