fuel consumption

If you haven't changed you driving style there may be a problem.

If it's a concern why don't you get it put on the dyno and get the emissions checked.

Might also pay to check for any fault codes in the ECU.

Could be injectors, timing, a faulty sensor, vacuum problem, throttle body, exhaust or a number of other things.

Plugs, leads and air filter will not make you use more fuel, if it had a lack of power or ran rough that wold be a different story.

Maybe it's just a Landcruise petrol!

Just to add to your idea of injector cleaning, dont waste your money on rubbish in a bottle, remove your injectors and have them cleaned, serviced and flow tested. Not cheap, but if yours has done a few kms, an injector service can make a big difference and will most probably improve your fuel consumption and power delivery. It definitely wouldnt hurt thats for sure. Just call around for prices because for whats involved, they all charge like wounded bulls.

Tippa,
Obviously you have gas over diesel.
I don't tow, but am surprised that you could use 35L/100km, and that you have halved costs by adding gas.
Mate I drive a miserable little Rodeo, 3L (TF, I believe, 2001 version.), and gas/chip have transformed the old girl.
But nothing like your savings in economy.
Which system do you use?
Thanks eh.
Jeff H.

Crikey I'm a goose Tippa: you're petrol /gas powered.
Sorry mate.
Ferdinand (the bull. aka Jeff).

Ha ha thats ok mate. Frankly i have never seen it use anywhere near 35L/100kms, but the previous owner, my father in law said he saw that all the way across the Simpson towing his camper trailer.
I don't work her as hard, an 8x5 box triler with a tonne in it is all she sees every so often. Towing that around town i think it uses about 25L/100kms of petrol and maybe 27L or so of gas which is less than half the price.

I did however have the gas installer crank up the power (via his laptop as we drove) so it goes possibly better on gas than petrol (well it goes very well and has more than enough torque for my needs) and now she sees around 350kms/80L gas which is around 23L/100kms city driving, so at 70c/L, compared to petrol at $1.55/L it is relative to 10.45L/100kms. It is cheaper to run than a car half it's weight.
So my opinion is that your early 80 series 'cruiser is getting normal fuel consumption figures, and if you want to reduce it's running costs, and can justify the upfront expense (minus govt rebate) then go for gas injection.
Cheers!

Ha ha thats ok mate. Frankly i have never seen it use anywhere near 35L/100kms, but the previous owner, my father in law said he saw that all the way across the Simpson towing his camper trailer.
I don't work her as hard, an 8x5 box trailer with a tonne in it is all she sees every so often. Towing that around town i think it uses about 25L/100kms of petrol and maybe 27L or so of gas which is less than half the price.

I did however have the gas installer crank up the power (via his laptop as we drove) so it goes possibly better on gas than petrol (well it goes very well and has more than enough torque for my needs) and now she sees around 350kms/80L gas which is around 23L/100kms city driving, so at 70c/L, compared to petrol at $1.55/L it is relative to 10.45L/100kms. It is cheaper to run than a car half it's weight.
So my opinion is that your early 80 series 'cruiser is getting normal fuel consumption figures, and if you want to reduce it's running costs, and can justify the upfront expense (minus govt rebate) then go for gas injection.
Cheers!

Which is around 18L/100kms. Not bad!
It does come down to driving style too and i fly past other 4WDs in the rush i normally am in, who would be getting better fuel economy than i would be. Except my fuel is half their fuel's price so i can afford to push the skinny pedal a little further ha ha.