What is it?
BlueMotion is VW’s tag for its ultra efficient derivatives, so far limited to this Polo, but soon joined by a Passat version.
Greater economy comes from simultaneously improving the efficiency of the drivetrain and reducing the work it has to do. The standard three-cylinder 79bhp 1.4-litre diesel, available in other Polos, gets a variable geometry turbocharger in place of the standard unit, and there are taller gear ratios to reduce engine revolutions at speed.
To save the engine graft, the cabin has been stripped of weight, there’s a new more aerodynamically efficient bumper, grille and tailgate spoiler, and lightweight wheels with skinny tyres to reduce rolling resistance.
What's it like?
“Do us a favour and test the fuel economy on that trick BlueMotion Polo”, said the road test ed. No problem, I said, before I did the maths.
You see, our normal procedure for checking economy claims is to fill the tank, run the car practically dry, re-fill, then divide the miles travelled by fuel used. Trouble is, this little diesel supermini’s 45-litre tank and 72.4mpg claimed combined economy give a range of over 700 miles for each tank of diesel.