OMG 4.8 ltr fuel consumption

[Alitis007]

*sigh* I've kept consumption figures for my rig since I got it.

My 4500 uses 30ltr per 100k's on lpg, more in low range. Always has. Two seperate lpg mechanics, two different dynos, regular service. Always told "yep, all good". Plugs and leads, the lot. I can tell when it needs a tune, economy improves and idle is rough.

When I ask about improving fuel economy I get told "Not much, they're thirsty buggers" and aftermarket ignition timing chips are "a waste of time" as it's mostly a mechanical system. I've got a mate with a 4800 and he gets about the same as me but with lpg vapour injection. When I asked about going to injection, "yeah ...sure, won't help much and $300 per injector + fit".

I read these consumption/economy threads front to back and try to follow any leads. Bigfella isn't the only one reporting figures I dream of and I wish I could pick the difference. Any ideas?

Best i ever got with my 4500 was 14.7l/100, i only have petrol no lpg and use 98ron i played with my timing and tps adjustment and now i average 15.8l/100. I think with an exhaust it might improve but like said earlier i'm going to try a snorkel and enclosed pod filter to see it than makes any difference. The bonus for the 4800 is that the timing is electronically controlled with the knock censor and the timing keeps changing all the time unlike our 4500 distributor having to be set to find a happy medium.

[Clunk]

Just go out and drive it and enjoy it....... if you wanted economy should have bought a Prius.......... OK that may have been a little too far........... get a diesel then!

[Bloggsy]

Just go out and drive it and enjoy it....... if you wanted economy should have bought a Prius.......... OK that may have been a little too far........... get a diesel then!

What Clunky said. Just enjoy it or buy a diesel. I used to worry about my 4.8's fuel consumption but now just enjoy driving it and don't worry about the fuel. I still keep track of how much it's using only for the fact that if it starts using considerably more than it normally averages (18-20l per 100km), then I at least know that something is not right or I've just been giving it hell LOL!

My 4.8 is quite a heavy beast with long range tank, dual wheel carriers etc, etc so would expect my consumption to be higher than normal. These extra accessories will obviously have an impact on you fuel consumption, for instance I used to have a rola racks with a full cage basket and this made the fuel economy 2 l per 100 km worse off.

It might be worth trying the PVA mod Jay on the other forum came up with. Some people experienced better fuel economy with this mod (I think those mainly with the later model 4.8 autos - mine is a 2003 series III). Made no difference to mine but I'm still running the mod due to some of its other benefits eg less hunting for gears in cruise control mode.

[Alitis007]

Whats the PVA mod

[MEGOMONSTER]

If your not getting enough Km's out out of a tank, the best way to fix this is get a bigger tank. Or we have found that idling everywhere will get you an extra 100km's.
tail gating will get you extra 13km's.
or if your a real lead foot, a brick behind the accelerator.


Never argue with an idiot, cos he'll bring you down to his level, then beat you with experience. Y2K

[Bloggsy]

Whats the PVA mod

It's the Power Valve Actuator, best to do a search on it, rather than me give you the wrong explanation - haha!!

Put the following into google, it should be the first hit it brings up for patrol4x4.com

"pva mod 4.8"

Cheers
Darren

[Alitis007]

It's the Power Valve Actuator, best to do a search on it, rather than me give you the wrong explanation - haha!!

Put the following into google, it should be the first hit it brings up for patrol4x4.com

"pva mod 4.8"

Cheers
Darren

Thanks mate i'll sus it out

[twisty]

My 4500 uses 16L per 100 K's on Petrol and 18/20 Litres per 100 K's on LPG 22Litres per 100K's towing my Jayco Dove
No Lift.No Roof Rack and standard Road Tyres

See, another one! Bob ... I hate you (not really ;-).

I just don't understand. I've run light (no roof racks and empty everything out except me) and the BEST I get is 28l/100k. Many years ago I raced slot cars and one bloke always beat us, I mean, he made us look silly! We did all sorts of mods, rewires, test and blew dozens of motors trying to match the b@stard. No joy. So we asked him and he claimed he had a "freak" motor. Now, I don't know if this was the case but when I see what economy others get from their "forklift" engines I feel like I've missed out, again.

It injures my male pride to feel so ... inadequate ... and bloated. I need icecream now!

[twisty]

What Clunky said. Just enjoy it or buy a diesel. I used to worry about my 4.8's fuel consumption ... normally averages (18-20l per 100km),

Easy to say when you have figures like that. Diesel isn't the issue either. eg. Bob and I have similar rigs (age,engine,fuel) and he gets twice the range I do. Only difference is I'm in an auto. Is that worth 15l/100km? Looking into the pva mod ...

ps. I see my rig as a lover. A very nice ride but expensive to seduce. And we keep doing it ... in the bush.

[Bloggsy]

Easy to say when you have figures like that. Diesel isn't the issue either. eg. Bob and I have similar rigs (age,engine,fuel) and he gets twice the range I do. Only difference is I'm in an auto. Is that worth 15l/100km? Looking into the pva mod ...

ps. I see my rig as a lover. A very nice ride but expensive to seduce. And we keep doing it ... in the bush.

Sorry Twisty I didn't mean anything by it. :-(

The PVA mod is aimed at the 4.8's.

I've heard o2 sensors can have a bit of a bearing on fuel economy if there not functioning correctly? Maybe worth checking out if you haven't already.