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Salut Erwin! Ce sont des resultats pour des tanks complets? Conditions meteorologiques identiques?

Not just tires, but different fuel formulation (winter vs. summer blend), increased bearing & drivetrain drag, air density, longer engine warm-up, and a bunch of other reasons. FYI: Why your Micra's...

When did you switch?

One thing to consider is warming outside temperature has a significant impact on fuel economy. Everybody's fuel economy is improving at this time of year, even when no other...

You won't hurt the car putting in premium.

The small improvement in fuel economy is probably not as big as the cost difference.

If money's no concern, don't worry about it.