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[albitz]

Must have been about quarter full then. Should cost approx. £100 from empty. .......which is a rather national disgrace.

[tunnie]

Must have been about quarter full then. Should cost approx. £100 from empty. .......which is a rather national disgrace.

Needle not far off the red

[JamesV6CDX]

Yeah, I think as it cost me £75 to tank it & only got 320 miles odd it defo needs LPG'ing 

So assuming petrol is 129.9, which is what I paid last night - you would have got about 57 litres for that money - so, 12.7 gallons.

Therefore, you've got 25.2  miles per gallon, which is 23.45p a mile.

On a V6 LPG, you can safely assume you'll get 15% less economy, so 21.42mpg on gas.

Basing gas on what I pay here, it's 76.9p per litre. On that basis, you're likely running cost on gas comes out at 16.33p per mile

Therefore, your saving, running on LPG, works out to be 7.12p per mile

You've said you do about 4k miles per year (from memory?) so therefore by running on LPG, you'll save £284 a year.

Also, based on the above savings per mile, if you buy an LPG kit at around £800, for argument sake, (which it easily will be by the time you've bought curry and beer ) your mileage to break even, will be 11,111 miles

Your kit will take over 2.7 years to pay for itself.

Is it really worth it?

On top of all that, if you're doing lots of short trips, you'll be initially running on petrol for that anyway, making the cost savings even less.

Hope this gives you some objective figures to consider / work with, in making your decision 

[tunnie]

Hi James,

Yup thats about the sums I was working save 5-8p ish per mile, when I was doing 450miles+ per week getting to work, its a no-brainer.

Now, I take a shuttle bus to work, does not cost anything. My miles now are mainly going back home, visiting friends / relatives.

Maybe max I'd do 2 trips back per month? I can't see myself getting more than 5k miles done in a year.

But, I kept my 2.2 for almost 7 years (infact we still have it) - I plan to keep this 3.2 a long time too, its got everything in a car I want, its fast, comfy, loads of space, Elite gadgets memory seats means anyone can jump in with ease.

So thinking long term, fact I can maintain 90% of things on it, LPG is worth while.

[JamesV6CDX]

I totally agree mate, if you're keeping it that long - gas it

[Lazydocker]

I find the calculations slightly flawed James.

When I got my estate I ran it for a short while on petrol and was getting about 320 miles (at most) to a tankfull, which cost (for ease of calculations) an average of £96. This isn't far off real world figures at the time. I make that 30p per mile.

On LPG, same journeys and driving style, I get 230 miles to £46 of LPG (consistently) on my normal driving, more on a long run (or if I let SWMBO drive ). That's 20p per mile. Saving (as previously stated and proven by Entwood's long running spreadsheet) 10p per mile.

Take into account the petrol used for starts and warm ups and it's safe to say that the saving is an average of 9p per mile

At 5k/year it's still only 2 years to payback (including the increased service costs for more frequent plug changes)

Oh, and incidentally, if he fits a Cylinder tank in the boot I reckon it will come in well under £800 considering I didn't pay that much for my Estate kit with an (expensive) Toroidal tank

[JamesV6CDX]

I find the calculations slightly flawed James.

When I got my estate I ran it for a short while on petrol and was getting about 320 miles (at most) to a tankfull, which cost (for ease of calculations) an average of £96. This isn't far off real world figures at the time. I make that 30p per mile.

On LPG, same journeys and driving style, I get 230 miles to £46 of LPG (consistently) on my normal driving, more on a long run (or if I let SWMBO drive ). That's 20p per mile. Saving (as previously stated and proven by Entwood's long running spreadsheet) 10p per mile.

Take into account the petrol used for starts and warm ups and it's safe to say that the saving is an average of 9p per mile

At 5k/year it's still only 2 years to payback (including the increased service costs for more frequent plug changes)

Oh, and incidentally, if he fits a Cylinder tank in the boot I reckon it will come in well under £800 considering I didn't pay that much for my Estate kit with an (expensive) Toroidal tank

Fair enough LD.... was only really basing them on the petrol MPG Tunnie posted...

I do totally agree, if it's being kept that long, it's worth gassing.

I am not really up to speed on what people are doing anymore, so didn't realise this car was going to replace Mr T's 2.2 - thought it was a project 

[TheBoy]

I have managed to get 11 mpg

I have done £10 of petrol in 15 miles before, back when petrol was £5 a gallon.  Its actually quite hard work to manage that sort of MPG over 15 miles without towing a roadblock.

[TheBoy]

Yeah, I think as it cost me £75 to tank it & only got 320 miles odd it defo needs LPG'ing 

So assuming petrol is 129.9, which is what I paid last night - you would have got about 57 litres for that money - so, 12.7 gallons.

Therefore, you've got 25.2  miles per gallon, which is 23.45p a mile.

On a V6 LPG, you can safely assume you'll get 15% less economy, so 21.42mpg on gas.

Basing gas on what I pay here, it's 76.9p per litre. On that basis, you're likely running cost on gas comes out at 16.33p per mile

Therefore, your saving, running on LPG, works out to be 7.12p per mile

You've said you do about 4k miles per year (from memory?) so therefore by running on LPG, you'll save £284 a year.

Also, based on the above savings per mile, if you buy an LPG kit at around £800, for argument sake, (which it easily will be by the time you've bought curry and beer ) your mileage to break even, will be 11,111 miles

Your kit will take over 2.7 years to pay for itself.

Is it really worth it?

On top of all that, if you're doing lots of short trips, you'll be initially running on petrol for that anyway, making the cost savings even less.

Hope this gives you some objective figures to consider / work with, in making your decision 

I know tunnie is currently paying 129.7p for petrol and 67.7p for LPG.

If contemplating gassing, do so now. Start getting benefits now, rather than in 2 years time.

However, I know he likes his boot as well...  ...and with that stupid Bose shelf as well, space becomes tight.....

[tunnie]

Given I will keep it, I want to LPG soon as. Need to sort noisy tappets first

Also depends on when the LPG master is available

[omegod]

Whilst all your calculations are interesting there is another way of saving even more money, buy one that is already converted!

My Elite had a sequential kit already on it and cost me £1700 4 years ago( should still scrape in £900) and has had 40k put on it since without major issue so I guess by JamesV6CDX calcs I have saved around £2480 in fuel 

[JamesV6CDX]

I'd be interested in coming down to take the p1ss / lend a hand, if you do it

[Lazydocker]

As I said, as soon as I know what the situation is WRT me getting a full time employee to help out and give me time off I'll let you know That said, I'm sure you could manage it with the other volunteers even if you get it all fitted and then take a trip up to mine/part way for a calibration run, which I could easily meet you somewhere like Chelmsford (or possibly closer to London) and still be working/on call Although you'd have to accept that I may get dragged away at any point

[bigboykarl]

interesting how much lpg price differs across the country..from 64ppl in doncaster to 76.9ppl where jamesv6cdx fills up..i only pay 70.9 at borehamwood shell on the a1 just outside london

[aaronjb]

interesting how much lpg price differs across the country..from 64ppl in doncaster to 76.9ppl where jamesv6cdx fills up..i only pay 70.9 at borehamwood shell on the a1 just outside london

Much like petrol really - I was amazed people in this thread are filling up at 129.9! I haven't seen that price for six months or more; it's 134.9-135.9 where I live :-/

Although as a percentage of price, LPG does seem to swing around much more..