Follow the beaten path !
Dunno if this has already been suggested :
On the highway / motorway, you'll often see two tracks where the wheels of all the cars before you rolled most often.
In doing so, they slowly polished the road surface to a smoother state than the road next to it.
Follow the tracks.
Doing so drops my fuel consumption by about 0.1 L/100km (about 3%) @ 100 kph.
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Strayed to the Dark Diesel Side
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