LPG Pointers

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Charles827si
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LPG Pointers

Post by Charles827si » Mon Apr 21, 2014 7:34 pm

Just want to revive an old topic about LPG which I have been curious about for a few years now.

How many annual miles would make driving on Autogas viable?

Up until now I haven’t entertained the idea because I only drive 7000-10000 miles each year.
If I’m right in thinking LPG is about half the price of unleaded currently then I would probably drive a fair bit more. At the moment I only drive on a must basis because I have to fill up with unleaded once a week. I was quoted £1500 last year for an Autogas approved conversion.

Speaking to my Rover mechanic he didn’t recommend LPG at all but on the other hand everything I have read about LPG either on the internet or by talking to other people has been positive.

What does the future look like for Autogas? I know there are a few here that run on this so I would appreciate all suggestions and feedback. :)
Charles 'Yorks'
"88 827si Fastback (manual) - Mum owned from new
"92 827 Coupe (manual)
"88 827sli Saloon (auto)
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Re: LPG Pointers

Post by Richard Moss » Mon Apr 21, 2014 7:58 pm

LPG will be around as long as petrol is and the government appears to be committed to maintaining the price differential. Given that the "per mile" costs are about 45% lower then you will have paid for the conversion when you have spent about £1700 on LPG (during which time you would have spent £3200 on petrol). If that unleaded costs £1.40 per litre then that would be 2285 litres or 503 gallons.

If your car does 30mpg, then you will need to do about 15,000 miles to get your money back. If you do 25 mpg then you'll only need to do 12,600.

The 827 runs nicely on LPG - especially mk1s with no cat because you can advance the ignition timing to take advantage of the 110 RON fuel :)
Out in the desert with a 1998 Grand Cherokee V8, 2004 Jeep Grand Cherokee 4L and a 1997 Chevy Tahoe V8. Back home: 1969 MGC GT

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Re: LPG Pointers

Post by Charles827si » Mon Apr 21, 2014 8:11 pm

Thanks Richard. This sounds very promising. I’m pondering about getting the Mk2 827 converted. I’m not sure how much mpg this does but when I do use it I’ll find out and it’s likely I’ll do more miles up to 15000 after the conversion.
Charles 'Yorks'
"88 827si Fastback (manual) - Mum owned from new
"92 827 Coupe (manual)
"88 827sli Saloon (auto)
2011 Lexus IS220D F Sport
It's a stick shift? No, It's a grip shift!
ImageImage

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Re: LPG Pointers

Post by Charles827si » Mon Apr 21, 2014 8:13 pm

Just one thing I thought of though. If you advance the ignition to the max, will the car still run ok when switching back to petrol?
Charles 'Yorks'
"88 827si Fastback (manual) - Mum owned from new
"92 827 Coupe (manual)
"88 827sli Saloon (auto)
2011 Lexus IS220D F Sport
It's a stick shift? No, It's a grip shift!
ImageImage

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Re: LPG Pointers

Post by Richard Moss » Mon Apr 21, 2014 8:18 pm

It always did on my mk1 - but why would you run it on petrol? The advanced ignition would only be an issue when driving hard and anyway, the mk2 doesn't have the feature so won't apply to you.
Out in the desert with a 1998 Grand Cherokee V8, 2004 Jeep Grand Cherokee 4L and a 1997 Chevy Tahoe V8. Back home: 1969 MGC GT

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Re: LPG Pointers

Post by Charles827si » Mon Apr 21, 2014 8:21 pm

Richard Moss wrote:It always did on my mk1 - but why would you run it on petrol? The advanced ignition would only be an issue when driving hard and anyway, the mk2 doesn't have the feature so won't apply to you.
If the tank runs low on gas doesn't it automatically switch to petrol?
Charles 'Yorks'
"88 827si Fastback (manual) - Mum owned from new
"92 827 Coupe (manual)
"88 827sli Saloon (auto)
2011 Lexus IS220D F Sport
It's a stick shift? No, It's a grip shift!
ImageImage

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Re: LPG Pointers

Post by Charles827si » Mon Apr 21, 2014 8:40 pm

Below are rough calculations I made with the help of the internet

15000 Miles
29MPG
129.9 Unleaded Fuel cost pence/Litre

= £3054.50
LPG is about 15% less efficient then unleaded so I did 15% of 29mpg which is 24.65
15000 Miles
24.65 MPG

71.20 LPG Fuel cost pence/Litre

=£1969.67
Last edited by Charles827si on Mon Apr 21, 2014 8:42 pm, edited 1 time in total.
Charles 'Yorks'
"88 827si Fastback (manual) - Mum owned from new
"92 827 Coupe (manual)
"88 827sli Saloon (auto)
2011 Lexus IS220D F Sport
It's a stick shift? No, It's a grip shift!
ImageImage

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Richard Moss
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Re: LPG Pointers

Post by Richard Moss » Mon Apr 21, 2014 8:42 pm

Should do but if you're converting a mk2 then they don't have the manual ignition advance so there's nothing to worry about. You will need to run on petrol for a brief period when starting - I used to do about 30-60 seconds on mine.
Out in the desert with a 1998 Grand Cherokee V8, 2004 Jeep Grand Cherokee 4L and a 1997 Chevy Tahoe V8. Back home: 1969 MGC GT

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Re: LPG Pointers

Post by Charles827si » Mon Apr 21, 2014 8:49 pm

Richard Moss wrote:Should do but if you're converting a mk2 then they don't have the manual ignition advance so there's nothing to worry about. You will need to run on petrol for a brief period when starting - I used to do about 30-60 seconds on mine.
Say I drive 50 miles a week (which I do about) - it's not worth the conversion so I'm wondering if I can somehow justify driving more miles. Though this is all theoretical. I need to do more homework.
Charles 'Yorks'
"88 827si Fastback (manual) - Mum owned from new
"92 827 Coupe (manual)
"88 827sli Saloon (auto)
2011 Lexus IS220D F Sport
It's a stick shift? No, It's a grip shift!
ImageImage

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Richard Moss
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Re: LPG Pointers

Post by Richard Moss » Mon Apr 21, 2014 9:20 pm

Simply not worth it unless you're doing several hundred miles per week or plan to run the car for a very long time.
Out in the desert with a 1998 Grand Cherokee V8, 2004 Jeep Grand Cherokee 4L and a 1997 Chevy Tahoe V8. Back home: 1969 MGC GT

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Charles827si
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Re: LPG Pointers

Post by Charles827si » Mon Apr 21, 2014 9:34 pm

Ok.. At present my mileage varies widely somewhat, contradictory to what I was saying. This conversion will be later down the line.
Charles 'Yorks'
"88 827si Fastback (manual) - Mum owned from new
"92 827 Coupe (manual)
"88 827sli Saloon (auto)
2011 Lexus IS220D F Sport
It's a stick shift? No, It's a grip shift!
ImageImage

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Re: LPG Pointers

Post by CHR15E » Tue Apr 22, 2014 9:36 am

The only issue I ever had with LPG is not enough local stations to me.

I would make sure it's easily available on your normal routes if you go down that route.
Chris
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dead827
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Re: LPG Pointers

Post by dead827 » Tue Apr 22, 2014 7:04 pm

I have a complete single point with leonardo feedback system for sale, all parts were removed from my late white gold sterling, the tank is a new one (2012) £100 for the lot includes new copper pipes . or you could go for the red sterling running with tax and mot to end of august, with fitted lpg system and a good filler neck £500

location essex.
300,000 mile white gold sterling on lpg Gone RIP
150,000 mile red sterling on lpg Still around
100,000 mile BRG rover sterling not on lpg Passed on

shiny blue jag on lpg
Another blue jag 2.5 auto

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Charles827si
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Re: LPG Pointers

Post by Charles827si » Tue Apr 22, 2014 8:19 pm

dead827 wrote:I have a complete single point with leonardo feedback system for sale, all parts were removed from my late white gold sterling, the tank is a new one (2012) £100 for the lot includes new copper pipes . or you could go for the red sterling running with tax and mot to end of august, with fitted lpg system and a good filler neck £500

location essex.
Thanks but this moment in time isn't right for me. Hope you find a buyer for yours.
Charles 'Yorks'
"88 827si Fastback (manual) - Mum owned from new
"92 827 Coupe (manual)
"88 827sli Saloon (auto)
2011 Lexus IS220D F Sport
It's a stick shift? No, It's a grip shift!
ImageImage

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