Well, I got through a tank finally - but there was a snag....
Saturday morning, I installed amp wiring throug the octavia and totally forgot to take the odo reading before I disconnected the battery - so I only know what I got within about 50kms.
Basically, I filled up with 52.5L and I had done about 1040km..... thats based on the last number I remember seeing on the odo before I disconnected :-(
So thats a tank average of just over 5 exactly, perhaps better, I'm not sure.
Anyway, I'm pretty happy with that given these conditions:
> Most of the tank was daily commuting, with a round trip of 100km.
> The tank included a trip into the city, and a trip to Newcastle at the beginning where I wasnt driving for economy (at all!)
> Also included 2 runs to pick up my wife at Macquarie Park
> Cold weather
> 100% biodiesel
> No tune at all.
I'm going to keep trying for 1200 :-)