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Round here there are so many people running on veg oil and companies producing biodiesel industrially that you have to pay quite a lot for used oil, if you can get any at all. That's what happens when diesel hits £1.10 a litre (about $5.86 per gallon).
The starting batteries would be unsuitable because the electrode plates aren't thick enough to deal with a load of 100 amps or so over any period of time, and would deteriorate over a few weeks. The rating on most starting batteries is only 40 amp hours or so, fine for hydraulics and ICE but inadequate for an EV. That's by no means an in depth explanation, but it's what I've gathered from other people's EVs.
This is why there aren't any EVs out there using standard starter batteries, even the ultra cheap Forkenswift used deep cycle lead acids.
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