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From: mervyncp on 4 Jan 2007 09:39

have recently purchased a previously converted Jaguar X300 3.2. It is
fitted with a Romano Single Point system, has been converted about 20
months and covered roughly 80k in that time. This is my first LPG
purchase and I am aware now that this is probably NOT the best system
for this car.
I am very happy with the way the car runs, it's smooth and very happy
on gas.
It is the gas consumption am not happy with. On a run the computer
indicates, if it was using petrol, it is averaging an expected 27mpg.
It is however only doing a factual 17-18mpg on gas. In normal use on
gas it is returning 14-15mpg.
Most of the stuff I 've read indicates a fuel increase of 10% on gas.
Is the gas consumption I am getting to be expected, or should it be
better than this?
Best regards
Mervyn




--
mervyncp
From: CJ on 4 Jan 2007 15:10

"mervyncp" <mervyncp.2jwc3g(a)autobanter.co.uk> wrote in message
news:mervyncp.2jwc3g(a)autobanter.co.uk...
>
> have recently purchased a previously converted Jaguar X300 3.2. It is
> fitted with a Romano Single Point system, has been converted about 20
> months and covered roughly 80k in that time. This is my first LPG
> purchase and I am aware now that this is probably NOT the best system
> for this car.
> I am very happy with the way the car runs, it's smooth and very happy
> on gas.
> It is the gas consumption am not happy with. On a run the computer
> indicates, if it was using petrol, it is averaging an expected 27mpg.
> It is however only doing a factual 17-18mpg on gas. In normal use on
> gas it is returning 14-15mpg.
> Most of the stuff I 've read indicates a fuel increase of 10% on gas.
> Is the gas consumption I am getting to be expected, or should it be
> better than this?
> Best regards
> Mervyn
>
>
>
>
> --
> mervyncp

Sounds about right.

I'm running a Classic Range Rover 3.9L and, after a long run to the
Highlands, VERY fully laden, it returned the equivalent of 27mpg.

Obviously your equivalent mpg will vary according to how cheap your local
LPG supplier is. My local Jet station charges 39.4p/L hence my above mpg.

Regards,

Colin


From: plod on 5 Jan 2007 08:41
Hi Mervyn,

It sounds a bit thirsty to me. I had a 4 litre XJ6 on an early
sequential system, and when the trip computer gave an average readout
of 25mpg I was getting 22mpg on gas. I know the single point system
will not be quite as good, but I wouldn't have thought you should be
less than 20-22 when it's reading 27mpg.

As a comparison, I get around 14-15 mpg out of my 4.2 Rangie in normal
use on gas, and that's a single point system, and I don't have the
lightest right foot! I would expect a 3.2 Jag to significantly improve
on that.

I would think your system could do with a tickle in the tuning
department!

Cheers,
Rich

mervyncp wrote:


> It is the gas consumption am not happy with. On a run the computer
> indicates, if it was using petrol, it is averaging an expected 27mpg.
> It is however only doing a factual 17-18mpg on gas. In normal use on
> gas it is returning 14-15mpg.
> Most of the stuff I 've read indicates a fuel increase of 10% on gas.

From: Emelita Cullip on 5 Jan 2007 15:14
I have a 1995 XJR 4 litre, Full sequential gas Injection system and with a
realy heavy right foot I get 22mpg on petrol and 22mpg on GAS same measured
from tank fill to fill
not Computer, however the computor also tells me the same mpg, if I use
Cruise control I get 25mpg at 80 mph.
I have had 3 X300's and 1 XJ8 and mpg has always been accurate on the Fuel
computer
Singlepoint gas systems will return anyware from 15-25 % less than petrol
and poor consumption is always down to a badly tuned gas system and or to
large a Plug gap.
Em



From: entwisi on 7 Jan 2007 15:23
On Thu, 04 Jan 2007 14:39:14 +0000, mervyncp wrote:

>
> have recently purchased a previously converted Jaguar X300 3.2. It is
> fitted with a Romano Single Point system, has been converted about 20
> months and covered roughly 80k in that time. This is my first LPG
> purchase and I am aware now that this is probably NOT the best system
> for this car.
> I am very happy with the way the car runs, it's smooth and very happy
> on gas.
> It is the gas consumption am not happy with. On a run the computer
> indicates, if it was using petrol, it is averaging an expected 27mpg.
> It is however only doing a factual 17-18mpg on gas. In normal use on
> gas it is returning 14-15mpg.
> Most of the stuff I 've read indicates a fuel increase of 10% on gas.
> Is the gas consumption I am getting to be expected, or should it be
> better than this?
> Best regards
> Mervyn

I get ~22 MPG on my Volvo 2.5 LPT which sits at ~80 mph for 90% of my
journeys.

This is my 3rd LPG conversion and I've yet to have one that didn't lose
20% of its petrol mpg however I can't tell with the volvo as it was
converted by my usual installer the day after I picked it up so I have
done very few miles on Petrol.

Based on my LPG usual price of 40p/litre you getting teh equivilant of
about 40 mpg out of a 6 cyl Jag. Not bad in my eyes

--
Entwisi
FBOTY#2003 PIT#03(KoTL)
XL1000V Varadero, CB250RSA(The Lozzo Tart), Guzzi Mille GT

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