The European NECD cycle is good because it's challenging for European hypermilers, only the best can beat it.
I compared a car that is sold on both markets :
2012 Golf VI 2.0 TDI 6 speed manual
EPA combined : 34 mpg
NEDC combined : 52 mpg
I only had once the opportunity to drive a newer car (Golf Bluemotion) and got 69 mpg (11% better than NEDC) on unknown roads. On my daily commute, I'd probably hit 75-80 mpg.
One of the most efficient cars here is the Renault Clio that is rated 74 mpg. The average on spritmonitor is 47 mpg...
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