44 replies to this topic

[rexy]

Use more LPG than petrol - what a crock!
The torrie 308 and driven hard av 26L per 100KM with prof tuned quaddie on petrol. On gas research twin system used 20L per 100KM, driven possibly harder!
If you choose a cheap shit system yes you may suffer. Pay for the good stuff, its nearly always worth it. Highway only driving was much better and with a useable 76 litres in the tank range was nearly 500km.
R

[xu1kid]

my old wb ute 308 trimatic 3.08 diff had a smallish cam in it, 97 litre tank ohg x convertor and the fuel economy was sh&t house around 210 to a tank, appently the motor was built for turbo when i bought it so low comp mayb that effected the fuel economy it struggled to rev over 5000 but the old ute has a new owner now so its his problem

but my new vs ute has an impco system on it and its a dream to drive and great economy too

+1 for lpg for me

[FastEHHolden]

I have to raise the car.

[Steve TPF]

I've been running my L300 van on gas for several years now (was fitted when I bought it). It's cheap in Melbourne (50-55c), and I'm glad I have it. The only reliability issue I have had was with a corroded terminal on one of the shut-off valves. Damn thing wouldn't start sometimes. Once I fixed that, no problems. The van is pissweak admittedly, but in the breif period I ran it on petrol it did't seem any more powerful.

I'm going to fit a proper gas carby when I have the cash, do away with the crap diffuser ring. Be interesting to see if it makes any difference.

[ls2lxhatch]

The LPG Autogas Australia Payback Calculator factors in a consumption increase of 30% when using LPG.

If you put in petrol as costing $1.00 and gas at $0.77 then the calculator works out that the cost is the same. This is because you have to buy 1.3 litres of LPG to get the same mileage as 1 litre of petrol.

Edited by ls2lxhatch, 08 March 2010 - 07:33 PM.

[rexy]

Unfortunately the provided herd statistics on LPG conversions and consumption are nearly irrelevant to the individual. As the reports in this thread so far indicate there is a wide variation in consumption post converion. I bet some of the respondents would love to have seen only a 30% increase over petrol.
My point?
A well set up and tuned conversion does not necessarily increase consumption in L/100km terms.
Another nail in the coffin of the herd stats - my VY2 SS sedan has the same consumption on LPG and petrol using a current technology ecu controlled vapour gas system. It was money very well spent.
R

[Steve TPF]

This article on LPG vapour injection is an interesting read.

So if aftermarket LPG has progressed to this extent, is there are any bad news? John Parnell was frank.

"Typically there's a 3 per cent drop in power," he said. "But I don't know if many of our customers are really concerned by that. I always tell them that driveability remains exactly the same as on petrol."

More serious is the rise in fuel consumption. John Parnell says that typically fuel consumption on LPG rises by 15 � 20 percent.

"That's more than our competitors will tell you but it's what I have seen on the emissions test cycle," he said.

[

[ls2lxhatch]

The LPG Autogas Australia Payback Calculator factors in a consumption increase of 30% when using LPG.

If you put in petrol as costing $1.00 and gas at $0.77 then the calculator works out that the cost is the same. This is because you have to buy 1.3 litres of LPG to get the same mileage as 1 litre of petrol.

I see where you are coming from but when is the last time you bought premium ULP at $1.00 per Ltr? gas is still a viable option imo and currently priced a lot cheaper then premium petrol.

You appear to have completely missed the point. My post was replying to this.

Use more LPG than petrol - what a crock!

The point is that LPG Autogas Australia Payback Calculator factors in using 30% more LPG than Petrol.

The point of using $1 for petrol and $0.77 for LPG is to demonstrate that the calculator is using a %30 increase.

1.0 litres of Petrol at $1.00 per litre = $1.00
1.3 litres of LPG at $0.77 per litre = $1.00

Total saving $0.

The bottom line is that the energy available in one litre of petrol is approximately the same as the energy available in 1.3 litres of LPG. If you replace a poor performing petrol system with a state of the art LPG system then fuel consumption will not increase by %30. However if both systems were perfect then the difference will be approximately %30.

Edited by ls2lxhatch, 09 March 2010 - 07:42 PM.

[xu1kid]

i put 31 dollars of gas in my ute v6 vs 55 cents a litre i get 380 ks around town, now put 31 dollars of petrol@ $1.26 in and see how many ks you get, if the cost of gas was very close to petrol then there wouldnt be any real saving

[ls2lxhatch]

[xu1kid]