LPG is a fuel similar to gasoline, otherwise his "lightness" makes it more volatile and must be stored in tanks at low pressure.
It lends itself so well, pure, to gasoline engines (and diesel 25% GO / 75% GPL).
Advantages
gas injected, it avoids washing the cold cylinders by condensation of gasoline.
Its combustion less "crashing" reduces fatigue of internal parts; the absence of sulfur, benzene, lead and additives meets the oil that retains its qualities for longer.
Therefore, drain are spaced and motors have a considerably longer life.
Drawbacks
Its combustion temperature is a little higher, 890 ° C instead of 820 ° C to gasoline, and LPG containing no lead disulfide, the exhaust valves of some engines are more fragile. HOWEVER, the corresponding models are few and well identified. There are two solutions to address this problem:
Replace these valves their steel equivalent to soduim.
Monitoring, during the interviews, the valve clearance and quality of motor fuel.
This solution is much simpler and generally sufficient to ensure proper engine operation. Indeed, too many unsuitable LPG Kits put the engines at full load mixture poverty situation, causing elevated temperature such that the valves "burn out".
For the peace of clients, TOPGAS provides an engine warranty with these LPG installations.
source: topgas in forum LPG
LPG and CNG give access to a number of advantages that make fuels by far the most economic ...
Tax refund of Fuel
LPG is currently sold at about € 0.70 liter for € 1.25 the No-Lead 95 and 1,12 € diesel (prices recorded in the same station, on February 20 2006). This corresponds, taking into account a LPG consumption rate 10% from gasoline (which is a maximum):
To make a 50% saving on your fuel budget !
Save 20% on your Gas Oil budget!
Carte Grise Free
that fitted LPG vehicle owners benefit from free car registration in some regions (Ile de FRANCE, Centre, Midi Pyrenees, Aquitaine, Centre, etc ..).
State aid of € 2000
The French state provides assistance to 2000 € for the equipment of a new vehicle or less than three years to LPG or CNG (producing less 140g of Co2 / km).
This assistance may reach € 3000 in the event that buying the equipment and LPG are accompanied by the scrapping of over 8 years vehicle.
The aid is in the form of a tax credit or a payment of the full amount for non-taxation or the difference in case of tax lower than the sum.
On my R25 GPLed which soon 300 000 klm, no problem with the valves from a small time setting time (CCES easy and fast).
in current new vehicles (source PSA bienentendu 
)
