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In finland there is so little traffic that its not a problem most of the time. I can confirm if there is even one car behind me its not so fun to do it specially if the car behind be dont keep safe distance. Some will notice what I am doing and keep enough distance so it does no harm to them. Some will drive in the bumber and usually in that case I start to slow down so much that person will pass me. usually 10 km/h speed under the limit is enough. So I courage people to pass me in those cases.
Bigger truck are not the same case as small hatchbacks that is sure but on downhills you should see some gains with P&G. Next week I will be in a 60 tonn truck trailer combination to teaching hypermiling techniques so I will learn also myself more about the situation with big trucks.
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