Improving 4.2 Diesel economy

Seems thirsty doesn't it - I know someone with an 80 series stock diesel who would get about 14 L / 100Km at worst while towing a medium weight camper..... cruising at around 90 - 95kph, most times and with a generally light foot ! May be of use in your thoughts......

We get around 14l/100kms(a/c on) towing our camper trailer.When we moved up here fully loaded with dodgy pump and injectors we ave.16 -17l/100kms sitting on 100-110kph.Keeping the old girl around 90kph or around two grand helps heaps with economy.
I still believe that these vehicles should be more economical due to having no power to speak of,still toying with the idea of a petrol 4.5,sure it'll use more fuel but I will have the power to use where and when I want it and driven well will still return around 16l/100kms.Also get stronger g/boxes and front diff's.
Do you have std tyres on,if not have you taken into account the speedo error??

Slow down, keep engine tuned properly, clean air filter, recommended manufcturers tyre pressures and go lightly on the accelerator.

If you are happy with your current truck in all other respects, it is false economy to change just on fuel consumption as the cost of change will not doubt buy a heap of fuel.

If you are thinking of changing, well it depends on petrol or diesel. Our Rangie and Troopy both cost around the same per km in fuel as petrol is cheaper than diesel. Diesel has higher maintanance costs if you do it properly but we have additional advantages in the Troopy like twice the range due to twin tanks.

Stevesub

I fitted a turbo to our 1HZ diesel and it made a heap of difference, not so much outright MPG but in reduced pedal use which in turn improves fuel consumption.

Cheapest way is to invest in my new beaut fuel saving device , for the very reasonable sum of $584 with a 125% 90 min money back guarantee ,[guarantee starts from the time you pay me and payment MUST be received prior to shipment of device] ,this fuel saving device will save you upto 50% of your fuel usage ,[only because you only have 50% of throttle ] ,the device is called " The All Alloy Flitch " pat pending , consists of an all alloy block 80mm long x 40mm wide x 30mm thick with a new age substance [supaglue ,supplied] which is fitted to the underside of your throttle ,,,, this device is currently under test by well known motoring experts such as the University of Car Science based in Nigeria ,, so you want to save fuel ?? send me your money...Remember you have a cast iron 90minute guarantee or your money back at 125% [less my costs + shipping = $0 for you] ,, send me your order NOW.

Hi Sammo, I've owned 3 cruisers over the past 8 years all naturally aspirated 1HZ's. All had over 200K on the clock. My first 75 series would average 12L/100km, the second 14.5L/100km and my now 100 series about 15L/100km. Now I drive very light footed and never go over 110km/hr unless deserate to overtake. I've maintained all of them rigorously.
The worst I did was towing a huge furniture trailer loaded in my first 75 series from adelaide to perth and i averaged 19.5L/100km. I couldn't get over 100km/h and probably only averaged 80km/h.
Don't know how heavy your CT is but 20L/100km does seem pretty high unless you were trying to qualify for Bathurst on the way ;)
Would try getting a full service and maybe getting the timing and injectors checked.

Sammo
From my experience fitting a turbo will not reduce your fuel consumption in fact it may even increase it a small amount. Of course the additional power & torque are a big plus.

Toolman

Sammo,
We have a 2004 TD LC, have just done 4,500km to Alice and back.
I am light on the foot, tyre pressures on black top 45psi, 3.2tonne weighed b4 leaving, roof rack, not towing anything though, sat on the 100kmph mark most of the time and averaged 12.3l/100km.

This is pretty consistent result for us. If not loaded up and standard tyres on sitting on 100kmph, can get 10L/100 out of it.

Everything is standard as purchased, no mods to motor.

Regards

Mate go buy a couple of Hiclones, K&N Air filter and a snorkel... Its cheaper than buying a whole truck (OMG!!) and will increase your power whilst reducing your fuel bill....

Ive had 6 4wd's over the past 10 years and ALWAYS use this combo. It really works and is cheap compared to buying a new truck... I get mine from here...

www.hicloneqld.com/

This guy sells the lot and is a good bloke. He also offers a money back G'tee. Good luck!! :)

The biggest problem we found with the cruiser utes among our mates, late 80's early 90's models was that the timing on the pump was always too retarded. Once we got onto this we advanced the timing about the thickness of a pencil line, very little indeed, and you would not believe the difference. If you go too far you will know as it will start to get smokey. Turn the pump away from you to advance it. A mates cruiser ute would only do about 120 down a steep hill..........eventually. Now it will easily pull 140 on the flat in 5th gear. This fix was told to us by a diesel fitter. From memory there is 2 or 3 bolts on the front of the pump and a big one on the back! You won't be sorry if you do this as it improves fuel economy out of sight as well!

Cheers.....................Pete!

Thanks for all the suggestions; reckon I'll look at the tyre pressures first - could be the answer maybe.

First tank fill up on our new LC 79 TD returned 10.8 running in.
Very pleased with that. Turbo was worth the extra expense. More than enough power and a lot less gear changes.