The upside is that I have a 4kw micro power generation station, so running one would be almost 100% free!
I think you've just answered your own question Peter! Get that deposit down.
Look at the capital outlay as an offset against reduced future mileage-related depreciation on the +8 which would trend down to 'normal for year' as you used the EV3 (EVFree in your case!) for most local and short fun trips.
Here endeth the man-maths lesson.
