u dont need to tank it, i ease the throttle back on take off to insure grip, i found out this morning at the traffic lights, some office nobby in his 06 ASTRA VXR fought he could beat me off the lights , but to his horror was surprise to see me beat him from lights and he couldnt re3cover the 20 yards i gained from launch mode!!. we followed each other onto the motorway, i was tucked in behind him at 70mph, waiting for the car infront of him to pull aside, i prepared the sport mode, and from 70 right up to the lofty heights of 130 last look, over a short distance, i was sat on his bottom at the way. it was the 1st time ive really tested the car since buying it and i must say , i was really taken aback by being able to stick with a 250hp astra vxr!!. i then quickly fell back into my usual sunday morning mode and departed from the nxt junction!. What fun... but not a usual habbit i must say, but nice to try it once in a while