XR8 thirsty

[mr_xr8]

just to start im not here to complain about not get 7L/100km

latey ive only been getting 250/300km out of a tank in my au xr8
the car has been tuned at autotech runs a G&D intake, hurricane headers and 2.5 inch exhuast and a 3.7 diff (car is auto)

the oxygen sensors have been changed this made no diffrence
swapping tunes between tunes (running the sme tune for 2 weeks with no change) makes only about 10-20km diffrence. always run on 98.
car has had the snapon diagnostic tool hooked up and has showed no errors as well.

the car has been run on the dyno to get air/fuel ratio, they where 12.5/1 but the graph isnt flat like it was on the autotech print out. this was a power run as they only had time for this. it was a little wavie but no spikes.

p.s it isnt getting flogged everwhere, driven in a normal manner while testing all this

should i suck it up or is there something wrong?

[markxr6t]

Fill it to the brim, drive for 2-300km doing 100 or 110km/hr on a highway and fill it to the brim again. You shouldn't use more than about 10l/100km doing this (and even less if its been tuned???) and if you do then something aint right!

[BillC]

Mate, I have an XR8 auto and I get abot 450 to a tank around town. DTE always says 550 but I don't quite believe that. On highway I get about 700. All I have is a K&n filter and an SS induction Kit and a 3 inch cat back exhaust. No special tunes or anything. 250 to 300 out of a tank aint good

[MRS_XR8]

gees looks like I have a new Hubby lol

Mine gets about 350 ks a week thats mainly alot of stop starting traffic. And I wouldn't say that I'm too lead footed ok maybe sometimes.lol
Sounds like you should be getting a few more k's than what u r.