how many miles?

fidel · Dec 9th, 2008, 14:16

Hi,

I have a '99' V70 10v 2.5ltr, running on a LPG conversation. I was wondering how miles I should be getting, is it the same as petrol? or does it change when running on LPG? My car has a 58ltr tank, and I put in about £20p/w at 54.9p per LTR and get about 250 miles on speeds of about an average of 60 mph. I know this may be a silly question, but I just would like to know.

Many thanks.

John_C · Dec 9th, 2008, 15:47

You will get slightly less MPG compared to petrol when you run on LPG as it has a lower calorific value than petrol (i.e. you have to burn more of it to get the equivalent energy)

How big the difference is depends on the car and the LPG system in use.

Cheers,
John

davew · Dec 10th, 2008, 12:31

On average I lose about 4mpg running on LPG.

capt jack · Dec 10th, 2008, 12:42

Quote:

Originally Posted by fidel

Hi,

I have a '99' V70 10v 2.5ltr, running on a LPG conversation. I was wondering how miles I should be getting, is it the same as petrol? or does it change when running on LPG? My car has a 58ltr tank, and I put in about £20p/w at 54.9p per LTR and get about 250 miles on speeds of about an average of 60 mph. I know this may be a silly question, but I just would like to know.

Many thanks.

That sounds rather good to me. £20 at 54.9p/litre is 8 gallons in old money. 250 miles on 8 gallons is 31.25 mpg.

The steady 60mph is the key. You'll find that driving at 65/70 and above will really hike up the consumption.

In mixed driving (my daily 56 mile round trip to work - mixture of M-way and country lanes) my V70 2.5 10v auto conversion returns around 25mpg, the best I ever got on a long run was 28.8 mpg. Our 2.5 10v S70 auto runs on petrol and does a bit better at around 30 to 32 mpg, although covers fewer motorway miles.

The other thing that clobbers the mpg is the aircon. If you use it you will use up to 10% more fuel!

Cheers

Jack

The Hooded Claw · Dec 14th, 2008, 21:24

Quote:

Originally Posted by fidel

Hi,

I have a '99' V70 10v 2.5ltr, running on a LPG conversation. I was wondering how miles I should be getting, is it the same as petrol? or does it change when running on LPG? My car has a 58ltr tank, and I put in about £20p/w at 54.9p per LTR and get about 250 miles on speeds of about an average of 60 mph. I know this may be a silly question, but I just would like to know.

Many thanks.

Firstly, I totally aggree with the others.....slightly less on LPG...I run a 4.6 ltre Discovery with a 105 litre tank & get (Roughly) 350 to 400 miles on a tank.

BUT........ I would strongly advise you to seek out your local Gas supplier (the guys that supply LPG to the homes with central heating) they HAVE TO by law provide LPG from their tanks to "members of the public" don't be fooled into going to the local petrol station & buying it there.

Locally to me ( Blackpool) LPG is 54.9p at the garage but if I go into the Gas supplier (In my case CAM GAS) ..it's only 43.8p a litre...

the pumps are a bit antiquated but hey, yer saving a shed load of money on the Gas ..so who cares!!

Keith

cam · Dec 14th, 2008, 23:02

do gas conversions do any damage to the engine,heard somewhere they do.

Velorum · Dec 14th, 2008, 23:13

Quote:

Originally Posted by cam

do gas conversions do any damage to the engine,heard somewhere they do.

I think that there can be issues with valve seats on newer cars - not sure.

No problems on older models. LPG burns cleaner and there is very little oil contamination. My 240 has a 100% LPG conversion (thats right, no petrol) and runs great. There is one ex member of this forum that has exceeded 250,000 in a number of LPG fueled Volves no problem.

kev-g · Dec 15th, 2008, 15:40

my v70 is averaging around 23 mpg on gas but only had it just over a week so to early to get total figures my only problem is because mine is a factory built bi fuel it only has a 50ltr tank or 40ltr useable which means i'm filling up every few days where on my petrol mercedes i was filling up once a week

fidel · Dec 15th, 2008, 19:06

Just wondering, when I have been flling up on LPG during the colder weather when the temp was below 0 does it effect the gauge?? It is just that I have oticed when it is slightly warmer the gauge shows really quickly but when it is below 0 it takes longer.

capt jack · Dec 15th, 2008, 19:45

Ambient temperature absolutely does affect LPG.

You'll get more gas in your tank if you fill up on a cold day!

This must be because it's more dense at lower temperatures, and so slows down any movement of whatever wobbly bit is the level sensor I guess!

Cheers

Jack

Dec 9th, 2008, 14:16	#1
fidel Comrade Last Online: Mar 11th, 2018 06:39 Join Date: Oct 2007 Location: Norwich	how many miles? Hi, I have a '99' V70 10v 2.5ltr, running on a LPG conversation. I was wondering how miles I should be getting, is it the same as petrol? or does it change when running on LPG? My car has a 58ltr tank, and I put in about £20p/w at 54.9p per LTR and get about 250 miles on speeds of about an average of 60 mph. I know this may be a silly question, but I just would like to know. Many thanks.

Dec 10th, 2008, 12:31	#3
davew Senior Member Last Online: Jun 16th, 2011 15:27 Join Date: Sep 2008 Location: Nelson	On average I lose about 4mpg running on LPG. __________________ S80 - 301 Bhp - 450Nm

Dec 9th, 2008, 15:47	#2
John_C Allons-y! Last Online: Jun 8th, 2020 15:32 Join Date: Dec 2004 Location: Winchester	You will get slightly less MPG compared to petrol when you run on LPG as it has a lower calorific value than petrol (i.e. you have to burn more of it to get the equivalent energy) How big the difference is depends on the car and the LPG system in use. Cheers, John

Dec 14th, 2008, 23:02	#6
cam Premier Member Last Online: Apr 29th, 2024 10:33 Join Date: Dec 2008 Location: llanhari	do gas conversions do any damage to the engine,heard somewhere they do.

Dec 15th, 2008, 15:40	#8
kev-g Junior Member Last Online: Mar 3rd, 2011 11:35 Join Date: Dec 2008 Location: cinderford	my v70 is averaging around 23 mpg on gas but only had it just over a week so to early to get total figures my only problem is because mine is a factory built bi fuel it only has a 50ltr tank or 40ltr useable which means i'm filling up every few days where on my petrol mercedes i was filling up once a week

Dec 15th, 2008, 19:06	#9
fidel Comrade Last Online: Mar 11th, 2018 06:39 Join Date: Oct 2007 Location: Norwich	Just wondering, when I have been flling up on LPG during the colder weather when the temp was below 0 does it effect the gauge?? It is just that I have oticed when it is slightly warmer the gauge shows really quickly but when it is below 0 it takes longer.

Dec 15th, 2008, 19:45	#10
capt jack VOC Member Last Online: May 1st, 2024 22:55 Join Date: Jun 2006 Location: Selby, North Yorkshire	Ambient temperature absolutely does affect LPG. You'll get more gas in your tank if you fill up on a cold day! This must be because it's more dense at lower temperatures, and so slows down any movement of whatever wobbly bit is the level sensor I guess! Cheers Jack

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