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Shift points are preset in the computer I believe, so in terms of economy, manually changing is gonna do **** all, cause what Holden originally set will be best..Manually shifting will just hold the revs out, but it can lag when you change up. Pretty sure there was a detailed thread on this a couple of months ago, have a search and see if that can give you any more helptrue, but i can go through gears manually, believe it goes better? and plus, im planning on putting the tacho into my brothers r33 turbo soon lols.
but on that not does using the auto like a manual (shifting gears manually) make the car go faster than just letting the gears go alone?
ive noticed when driving at about 140 if i drop back down to thrid gear in the auto it starts accellerating rapidly..? lols
lip spoiler mate and yea thats a good choice