I don't do any extra driving to merely improve the numbers.
I sometimes do take a slightly (3.4 km) shorter, but much slower and more fuel efficient route after filling up, but it takes forever.
If I were to take this route for an entire tank, I'd beat the car's NEDC FC figures ... and do so using CNG that has over 20% less energy than what VW used during testing.
The - somewhat unexpected, I should say ! - shortest route, means going through a toll-tunnel twice/day, negating any advantage despite being 25% shorter (Toll 1 way costs as much as driving to work and back ...)
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Strayed to the Dark Diesel Side
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