We aren’t talking aboiut one car here. We are talking fleet mileage.
In order to make up for their SUV’s the smaller cars they sell would have to get 75 Mpg. Then they would have to be able to sell these little golf carts.
From California (of course) -
Neighborhood Electric Vehicle Low Speed Vehicle and Golf Cart Information FFVR 37
Neighborhood Electric Vehicle (NEV)/Low-Speed Vehicle (LSV) and Golf Cart On-Road Registration Checklist
To register your NEV/LSV or golf cart you may need:
A properly completed Application for Title or Registration (REG 343).
The out-of-state title or Manufacturers Certificate/Statement of Origin.
A vehicle verification (REG 31) completed by an authorized DMV employee or law enforcement officer.
Registration fees.
For a golf cart only: A Statement of Facts (REG 256) completed by the vehicle owner or authorized representative that states the vehicle meets the definition of a golf cart (per California Vehicle Code [CVC] §345) and has not been modified.
If your golf cart is gasoline powered it must have a label certifying the vehicle complies with California emissions requirements to be eligible for on road use.
Appointment(s) are recommended for faster service.
http://dmv.ca.gov/pubs/brochures/fast_facts/ffvr37.htm
The other thing is that the smaller, high mileage cars just have to be produced. Not one has to be sold and leave the dealers' lots.