Something to do with the electronics, and plus - I think - the lack of a distributor - so you cannot manually adjust the timing.
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My Machanic has suggested not to so as it damaging
I found a D2 that I was a little to late to buy which had 3 suber size tanks in the boot so it didnt take up much room I wonder if any other fitter can do the same I'll have to make some calls
Most LPG fitters can fit three 20 litre SCUBA size tanks instead of one larger 90 litre tank. Fitting the 3 smaller tanks costs more and you also then only have 60litres of storage as opposed to the 90litres using the one big tank.
It all depends how badly you want/need that space in the back. Personally, I'm not that bothered and can fit a cargo barrier to make use of the height in the back of the car instead.
also bear in mind that, despite what fitters will say, you will probably end up using more lpg than petrol, and this can be substantial - e.g. factory-fitted lpg Falcon uses 36% more juice than petrol version! (although I don't know if this is an injected lpg set-up). LPG has a much lower BTU ('energy') value than petrol which is slightly lower again than diesel - i.e. diesel is good gear if you can get it to burn efficiently - hence turbos, chipping, lpg 'fumigation' etc...