Why is it better to convert an existing vehicle to electric, instead of making electric vehicles fro

Why is it better to convert an existing vehicle to electric, instead of making electric vehicles from scratch?

Construction of the average automobile requires approximately 30-40 barrels of oil (or equivalent fossil fuels), primarily for powering the manufacturing processes. This is sometimes known as the "embedded energy". So there is a huge resource saving in converting an existing vehicle to electric - particularly vehicles which are becoming uneconomical to maintain as petroleum powered vehicles, and which may otherwise end up on a scrap heap. Electric conversions can give vehicles a new lease on life, and make them more reliable than ever. Think of it like car recycling!