The last few months has seen a vast improvement to economy. I changed to run only 98 Ron fuel, removed the Roofrack and keep tyres at 40psi. I would say this has seen an improvement of 1.5lph overall. I have not changed the way I drive - still give it a boot full every now and again.
I used to average 16lph round town and 20-22lph towing the jayco.
I was never unhappy with previous figures, just thought I would pay some attention to it.