fuel consumption

i have worked out that the valiant does 8.6km to the litre; i calculated this by filling the tank then driving from wellington to ashburton (487 km or 303 miles) then filling again - it took 56.5 litres. it's quite difficult finding information on the web about average fuel consumption, but from what i can glean it would seem that 8.6km to the litre is actually pretty good. (& of course while she's tucked up at gasoline heaven, she's not using much at all.)