So with all these questions of what MPG does all out cars do I set myself the task of trying to get a reasonable figure out my 3.0si. So last week I filled up with the normal optimax and reset all the dials. 250 miles later and I got 37MPG! From a 3 litre straight six! And I can honestly say I wasn't driving like a grandma - just employing some tactics like not booting it just to get up to speed and coasting in gear rather than braking. Well chuffed.
