when I had my 4 cylinder petrol engine converted, it cost £1400 +vat, and if it is a trade vehicle I think the tax is rebatable. The work takes 2-3 days, the biggest saving would be on tank size to be honest, the bigger the tank, the bigger the cost.
You really need to find a reputable garage that is certified to do the conversion, and yes, I would think it would invalidate your warranty. Speak to your Fiat dealer.
Also, find a good Gas supplier, that the Taxi firms use and they may negotiate a lower rate for the gas than advertised (48.6p a litre to me at the moment from 55.1)
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