Classic Range Rover 3.9 V8 - LPG System

[simonoly]

I've recently bought a 1992 Range Rover Vogue with twin LPG tanks underneath. The guy I bought it from told me that they were 2 x 40 litre tanks but it takes around 60-65 litres before the LPG pump slows down to full. Am I missing something or have I just been given the wrong info. Also, it only does 120 miles max from full and I was told it would do about 180 miles. (I'm not that thick honest!!!).

[markja]

lpg tanks don't fill to the brim like petrol tanks. they have to have room for the liquid to change to gas in . therefore 2/3 to 3/4 fill only.
i would get the system checked though 'cos i would have thought 120miles is low. or you have a lead right foot.

[DirtyHabit]

You will not get the same miles per gallon with LPG as you would with petrol. I get around 12% less miles when on gas.
I reckon you are getting around 9-10 miles mpg on gas so try finding out how much you get when on petrol. It's a big engine and your driving style need taking onto account.