res.q.guy replied:

I did a trip from Melb to Mildura and return last week and I was getting between 4.6 and 6.2 klm / lt on gas. Two in the car & not loaded or towing.
Regards
Neil

Diamond (Vic) replied:

gday smally.
the 4.5 heads arnt really good on gas.
valves burn out ect.
unless you want to spend big $ on doing the head.
cheers

franksy replied:

hi i have a 80 series 92 4l i get about 250 -300 ks out of 88litres this still works out better than petrol i only use petrol every now and then to keep the fuel pump working if you are in sydney i recomend you use riverstone gas they have a good name and are relyable

Pete. R. replied:

I had one on LPG with over 250,000km on it. Only problem I had was when I installed a snorkel, LPG and snorkels don't mix easily.
If you do get the LPG put on have them install a seperate O2 sensor in the exhaust manifold and don't let them use the OEM O2 sensor. After the gas is on take the truck to a Toy dealer and have them run a check of the OEM O2 sensor.

Tuff60 replied:

The other solution to LPG systems iwith snorkels is dump the vapour vacuum system and go for a Gas Research throttle body. Does not affect perfomance or economy on petrol and increases performance on LPG and 90% time economy as well. Also stops the slightly dirty air filter increasing your gas usage. Hope this helps.

prado_95 replied:

1FZ-FE engine will do fine on LPG, IF YOU DO THE MAINTENANCE PROPERLY.

I guess from the above your guess how I know? Dealer & 'autherised repair centre' services failed to check & adjust the valve clearances at 40K increments. Cost me $1700 because of their incompetence.

Now have over 280km, and some mods without further issue.

Dave