[ttimbo]

Overinflation is a good rule of thumb but, like all things, best in moderation.

The manufacturer's placard is the most important piece of information, as it reflects what the vehicle's engineers have determined to be optimal inflation, taking everything into consideration (ride, handling, durability). The advice from the tyre manufacturer is instructive, but not the final word, as the tyres don't know what vehicle they've been fitted to.

In my experience, I have found that overinflation of my M135i's tyres (say, 40psi) actually makes steering/handling/ride worse, so I've dropped back to 34psi front, 36psi rear. Steering, in particular, is much better -- it gets too light if the fronts are >36psi.

That said, the placard information for AndyLeng's car, at 41/43psi, seems very high. My conclusion is that BMW regard the 116ED as being all about fuel efficiency, hence recommend high tyre pressures in pursuit of that goal. If you can bear the ride/handling at those pressures, then that's what I'd use.