I did some runs up and down a section of Freeway at 0 (off), 2, 4, 6, and 8 and monitored the EGT, Boost, Water Temp and Fuel figures on my Scangauge.
Whilst it may vary significantly from vehicle to vehicle (I have 3 inch zorst, 33's and EGR is not yet blocked) I found that 6 to 8 seemed to be the best combination of driveability versus power and economy on my rig so I split the diff and it is set on 7.
Driveability will always be a subjective opinion tho and I will also be interested to see what effect blocking the EGR has...
Whilst it may vary significantly from vehicle to vehicle (I have 3 inch zorst, 33's and EGR is not yet blocked) I found that 6 to 8 seemed to be the best combination of driveability versus power and economy on my rig so I split the diff and it is set on 7.
Driveability will always be a subjective opinion tho and I will also be interested to see what effect blocking the EGR has...