I was able to find a video of what I was trying to say. If you would observe, once it got to 175, it was almost crawling and it started to stop at almost a hairline above 180 then it reduced speed to 175 and I suppose the driver eased off his step on the gas and when it got to 155, the driver put pressure on the gas pedal again but this time it was almost stuck at 170 already.

[ame=http://www.youtube.com/watch?v=AjPoDxsTdxA]isuzu dmax topspeed 3.0td 136ch - YouTube[/ame]