trailer
Francis,this is a little premature,as I won't have definitive data until after September,but due to the large turbulent wake of your Yaris you might consider a light,motorcycle swingarm-based,range-extender trailer.
The trailer does double-duty,providing extra battery capacity for the EV,and if shaped like a proper aerodynamic boat-tail,you've got a shot at cutting your drag in half which would extend range by 25% not to mention the extra batteries.
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