Fuel Economy - What do you get out of a tank? (3rd gens only)

[Tlmitf]

Geoff, do it, I have not looked back since fitting a set. It restores the lost power due to bad Y join design plus a little more power and more low to mid torque which is much appreciated in the AWD. As for fuel economy, one tends to drive harder after fitting one so naturally it will use more but I reckon because it has more low to mid range torque will help with fuel consumption. I also always shift manually and is in 5th at just over 40kph and reving at 1200rpm.
Just make sure you order the AWD one. the difference is the AWD rear pipe forms a circle shape as it curls around whereas the FWD version is more like a rounded corners square shape.

So the AWD headers are a better shape, from a flow point of view?
Will the AWD headers fit the FWD platform?

Also, ran up and down the freeway the other day - used 15/100 running from Murray Bridge to Adelaide, and the return trip reduced the average back to 13.4/100 - this is from the trip computer, running LPG.