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Yes. There was a short bit of gravel in the bit I didn't do, and some bits of broken road, but most of it was smooth, fast tarmac. Just needs enough time!
Although the bit I did - the first half 0 is the easy bit. It's not flat, but the second half is significantly hillier with some steep stuff. It goes up the mountain by Sarajevo where the TCR went up off-road one year - but this stays on the road.
That's what El Piri had in ~780km. So, budget enough time and it should be almost pleasant :)
All road?