Sorry about the mis post so try again.... here is a copy of my log book readings for the last 6 weeks. Very consistant i think.

Date km Ltrs MPG Lt/100k

19/06/07 20145 37.04 42.15 6.75 $45.52
25/06/07 20698 37.62 41.79 6.80 $48.50
02/07/07 21215 35.62 41.26 6.89 $43.78
09/07/07 21711 34.28 43.72 6.51 $42.13
16/07/07 22196 33.33 41.35 6.87 $40.97
23/07/07 22720 36.59 40.73 6.98 $44.24