So I've had the beast a month now and I'm averaging 100-150 miles out of a full tank of LPG (70 litres/£35) which the LPG guys say is about right?! Really? And this is taking it easy I might add.

Think you added that's it's a 4.4 V8 on the wrong thread....

You should be getting more than that, your getting between 6 to 9 mpg on those figures, you should get between 14 - 18 depending how you drive, which is about 20% less than petrol....

Very easy to make an LPG fueled car run nice by richening the mixture, find another garage and ask them to set it up properly, go on LPGA site to find a member....

 Pete

__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

Yeah I did, but once posted you can't delete! Thanks for the info and advice

I drive local most of the time, school run then to work etc
i recon i fill up (90 litre tank) 80 litres (give or take a bit) at a cost of around £35 (at the moment as prices go up and down but at 43p per litre )and expect to get 240 miles to a tank.
i dont always drive like miss daisy but 240 give or take.
When i get on the motorway, say on a good run then 350ish

Sleeper that's nuts - I am consistently getting 75litres to 190miles - I took it to a specialist as I initially had a few problems and they pointed out the Ecu was from 2003 and did not have the don interface, the injectors were as old and were over fuelling and that it wasn't ideal as the gas was fed with a 6mm pipe not an 8mm I got the first too done so far and get that economy in my 4.4 v8 is yours the dme engine ? Wht kit do you have ? I have omvl/zavoli aeb

Hiya
Mine a 2003 4.4 BMW Engine, not sure of the exact system but its prins (will check model later)
I recon it was fitted back in 2010-11 (before i brought th ecar)and i cannot remember all the details but the eloctronics were hardwired in, he changed them for plug and play, done loads of update etcI wrote a little bit about it here
http://www.fullfatrr.com/forum/topic37907.html

I cannot remember the exact milage but it will be around 240milel before the last two fill ups and the light was on red, so still some in there
27.05.16
83.5 litres
.38p per litre
£31.73 to fill up....Bargin!!

18.06.16
82.65 litres
.40p per litre
£33.06 to fill up....again Bargin!!

Mine's a 2003 with a BRC system. In mixed driving I get about 250 miles on just under 70 litres, which I think is 15-16 MPG. I've only run it dry once, I think I got nearer 260 miles but can't remember how much it took to fill it!

That pretty good - why s gas so cheap in birmingham was there yesterday and got .39 per litre although i noticed it was Callow Gas not Calor Gas!

mine does around 220 miles per 80 litre fill.

mine does up to 280 miles with 75L of lpg exactly the same mpg as my old classic but in this latter I can fill in 95 litre.
This is the downside of the L322, not enough room for a decent lpg tank if you want to keep your boot free
On long journeys the mpg can improve further more. Current:
- L322 2006 S/C lpg
- RRC 1988 lpg / 287 000 miles
- Stage one 1981
- Lightweight 1976
- 109 SW 1968 under rebuilt

Gone: none

How can this range vary so much between vehicles?

It can vary hugely on the same vehicle .

As always with a range rover, depends on where it's driven.

Driving in town (London) low MPG, outside town could easily be a 50% MPG improvement.

Lucky Belgian lpg drivers, I was traveling in Belgium one month ago sadly not into one of my RR but in my 109, the cheapest filling station I saw was this one

Click image to enlarge

I get 14.45mpg average, and used to do 17.76 on petrol - measured full tank to full tank since 2012.

My driving is a mixture of motorway and local roads and I tend to make reasonable progress if conditions allow.

Most miles I've got from the tank is about 250, and most I've got in is 79l. Current:
- 2017 L405 3.0 V6 Autobiography
Sold:
- 2013 L405 4.4 TDV8 Vogue
- 2004 L322 4.4 Vogue (BRC LPG)
- 2002 L322 4.4 HSE (having fixed timing chain guides)
- 2000 P38 4.6 Vogue (BRC LPG)
- 1981 2-door In-Vogue
- 1980 Ex-Army SIII LWB
- 1976 SIII LWB
- 1968 SIIA
Stripped for parts:
- 2003 L322 4.4 Vogue

That is cheap I was there two year back and it was 70cent a litre gone down a lot... If you know where to look here you can get it cheap I filled up in Birmingham on Tuesday for 39ppl I don't live near here but I will try and incorporate into long journeys if along the way now! Only 2miles off the m6 as well