Thread: How to improve 4.6 economy

Are you joking You dont buy a V8 petrol 2 ton + 4x4 with the aero dynamics of a block of flats and then complain about fuel economy . What were you thinking

Originally Posted by Hoges

On a trip a couple of years ago... minimum load, steady speed, no load on roof rack...

Hoges, Is this some white man magic I see

Not really. I got 11.4l at 110 on the calder a fortnight ago, but come to a hill or go throughout a town and that average quickly climbs to 13ish. A spot fuel measure is quite different to an average.
I think the main issue with Rob's figures is the roofrack.

Hi,

My dash figures are double that , but i think that is more to do with the fact it runs on LPG, but it still chews around 22l/100K on LPG.

Tune up time for me I reckon !

Steve

Anybody got any further opinions on the pros and cons of the bosch injector change for the gems engine? Whether the change is notable and meaningful?

Very interested in the injector change too, mine is averaging around 20l per 100km general driving with a fair ammount of highway in there.. its terrible.

Watch the vid and make your own mind up if you think its worth trying out a US$60 set of refurbished Bosch 3`s

[ame=http://www.youtube.com/watch?v=7oTirEZNRw8]comparison of Lucas type disc injector to Bosch design III to the stock GM multec. - YouTube[/ame]

Originally Posted by SteveFarmer

Hi,

My dash figures are double that , but i think that is more to do with the fact it runs on LPG, but it still chews around 22l/100K on LPG.

Tune up time for me I reckon !

Steve

LPG is a mix of butane (mostly) and propane. ULP is a mix of hydrocarbons which have molecules virtually double the length of LPG hydrocarbons... and for the sake of argument, twice the energy per unit volume... so for an engine with about the same efficiency, you might get about twice the distance from ULP than from the same volume of (liquid) LPG.... so 22L/100km is probably around the mark depending on driving conditions etc.