www.bp.com/en_au/australia/products-services/fuels/bp-ultimate-fuels/bp-ultimate-diesel.html . Pasted off BP site tonight. Whilst '"patented " there is no direct reference to any testing to prove the point of paying a significant premium for this product, nor any reference to their sites being squeaky clean to avoid any contaminates, which seems to be the biggest issue.
We saw a recently renovated site ( not BP)which appeared to have rainwater running level or over the fill points this year. (heavy for us, about 25mm in 20 minutes).

I guess the proof is in the pudding.
We travel Adelaide to Canberra quite regularly, and in my 80 series found that using BP Ultimate Diesel improved my economy a significant amount. We went from 18 l/100 down to 16.5.

Now in the BT50 I have found a slight difference, down from 13.9 to 13.4.

All trips have been towing a Vista Crossover at an ATM of 1650 kg.

Yes I have taken into account various other factors. These figures are from travelling to Canberra each month for the last 2 years.

The most significant factor in my economy is wind. The last trip we manage calm days over and back and the economy dropped to 12.5 l/100

G'day Dicko, here in Albury Wodonga, the premium is from 8 to 14 cents per litre , so half a litre less in 100km doesnt cut it for me, in Hewy's post above.