ive got over 10 000k's logged in my fuel book, only using std caltex diesel and vortex diesel. there is a deffinate klm advantage using the vortex ( average 15L/100 towing std and down to 13.5L/100 vortex), power also is up. but in saying that ive now just got a BP fuel card (caltex arnt everywhere) and after 2 tanks on BP diesel i cant comment on the klm differance yet but power is up on both forms of the caltex diesel.

(2.7tdv6 D4 towing 900kg at 110-115kph.)

cheers phil