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David, the octane rating is HIGHER. For LPG it is something around 105. CNG 
is around 120.  You are correct about mileage. An engine requires about 20% 
more (properly tuned) LPG than gasoline. Low temperatures do not affect LPG. 
It's diesel that freezes, not LPG.
I did think about doing this on my D but decided not to in the end. As 
someone already said the cost of the conversion makes it not worth the 
trouble, plus (at least in my country) they will soon add crazy road tax to 
LPG and then it will make no sense at all. On top of all that LPG is not 
healthy for the engine unless you have the $$$ to spend on a Direct LPG 
injection. Additionally with regular mixing of LPG and air you get nasty 
backfires.... so, when they install LPG they actually install a flap door in 
the airbox in case you get a backfire. Without it the airbox is history the 
first time it happens.
And of course the problem of where do you put the new tank? Usually it goes 
in place of the spare tire. The problem is that it is going to be tiny. No 
more than 15l - 18l and that would be enough for about 100-150km.
After learning about the LPG and CNG I decided to stay with gasoline. The 
price in Poland is currently around $5 per US gallon.

Tom Niemczewski
vin 6149 (in Poland!)
Google earth: 52°25'17.30"N 21° 1'58.00"E

----- Original Message ----- 
From: "David Teitelbaum" <jtrealty@xxxxxxxxxxxxx>

> The conversion is fairly straight-forward, the BIG question is where
> are you going to put the fuel tank? The main advantage (at least in
> the US) is NO ROAD TAX. BTW the octane rating is lower for LPG and the
> energy density is lower so your fuel mileage will be lower. You could
> also have problems if it is very cold in your area in the winter.
> Makes the installation more complicated.
> David Teitelbaum
> vin 10757
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