LPG on a rV8 is not the ideal conversion , you also loose space for other items or fuel , and will end up having an empty gas cylinder being lugged around for a lot of the time . Fuel burn is higher on lpg so less miles per litre on gas than petrol.
I could no longer live with 13-15mg on my 110V8 3.9i csw , so am in the process of fitting BMW M57 TD , which will give similar performance to V8 (could not face the lower performance of 300tdi or td5) . it should also manage about 25-29 mpg if driven at approx 55mph , i reckon  .
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