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LPG

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Range Rover Blues:
LPG is basically Propane, it's a by-product of refining Eurobox fule and burns more cleanly than petrol, so becasue it's waste that has to be burned and it's clean, it's a green fuel and taxed accordingly.

LPG may contane butane on the continent, this has the effect of increasing it's calorifice value closer to that of petrol.

Correct, it does burn hooter but slower, so it releases less power for a given swept volume (calorific value) but you can increase the ignition advance because LPG has an octane rating of around 115, the ideal compression ratio is around 11.5:1

On a single point you may well notice some drop in power, particulalry at either end of the rev-range where the fueling is not that good.  Some of the power can be regained by fitting an igbnition advance module, at around £110 from Chris Perfect, though I have found them cheaper by hunting around.
Inevitably the lower calorific value means lower MPG but our 3.9 on a draw-through single point can do 13mpg

On my multipoint I notice no drop in power, but it's a thirstly beast.  The ECU controlled fuelling is a better match to the petrol EFi system and this is where it scores.

Downside I can get it to do 9mpg with the BWSOW on and the Airconn
Upside, I don't care when it's 40 p/litre and it is a 5.0 TVR lump :wink:

Single point sytems can cause back fires, I got sick of sweeping up my air fliters so I fitted a K&N, these are backfire-resistant becasue they are built with a wire cage.
My multipoint cost £1250 and a couple of weekends to fit, I had the most expensive tank the upright torriodal (spare wheel).  A cheapo single point might be £350

LPG will make you engine cleaner inside, your oil will get less contaminated and the engine last longer as a result of both.

It may run quieter.

Because of the higher temp it is not adviseable to make an engine slog away in high gears, the lack of torque will discourage this anyway, but that high temp has been linked with porous block syndrome as well as some instances of cracked valve seats/springs, burned valves etc.
Your engine needs to be in top condition, I would also suggest adding a vbalve-saver kit to oil the valves, LPG is too dry.

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