Anyone work for TNT or fedex?

So slowing down to 54 mph is 0.85 metres per second slower than one at 56 mph, so for the sake of ease of calculation assuming the other vehicle is in fact doing 1 metre per second more than you then will take 50x2 plus whatever the length of his rig is probably 18m, in which case will take 118 seconds each time you are safely overtaken unless you are overtaken by a convoy of 10 vehicles may be somewhat less then.
That 1180 metres lost would take somewhat more than 20 seconds to get to where you would have been had you not reduced speed.
Perhaps someone on here who has even more time on their hands than I do could work out the additional fuel cost incurred reducing and increasing speed in this case■■?

I’ve done TNT, Royal Mail, Aspray, DPD etc… I always slow down to 54mph or whatever if a lorry is trying to overtake me. If you’re overtaken 10 times in 3 hours what would you lose? 20 seconds?
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