Fuel Consumption Issues

[Malcs15]

Trip computer?
and...
V8 Falcons don't weigh anything like a 'Trol or have the aeros of a brick.

You need to get the accurate K's (given 33's mean you actually travel further than your Odo states) and accurate litres used.
You can expect anything between 10 and 16 LPH depending on terrain, wind, auto/manual and driving style.
Most will average between 12 and 15 LPH on the bitumen anything over that is starting to get excessive

I'll do some calculations after a nice drive this weekend after I remove the rack and check the tyre pressure. I'll fill the tank and hit the road....

[threedogs]

Do you still have the std intercooler, it may be leaking giving no boost, is it oily at all?
I have an 04 and get 12/100k and towing sitting on 110kph 15/100k
When was the last time you serviced it, Air filter, maf sensor , etc
What mods have you done ,exhaust,chip etc????
Run some injector cleaner next full tank