I would find an efficient Oil Burner, or try LPG + Petrol.
Electric vehicles just shift where the energy is created, it's often created by power stations that waste fuel as they can't produce on demand efficiently. The Batteries cost a lot to make, transport and to dispose of. Add to that the total in-convenience of having to find a charging point and they realy make little sense.
Even a relativly old VW 1.9TD will probably see into 60-70's if driven conservativly in a roadster. You may have to calculate so gearing ratios to keep the engine at it's optimum.
TT
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