The revised gearbox ratios for 5th and 6th would explain the 4-5% improvement in combined fuel economy, while not sacrificing 0-100 times.
There's very little variation in weight between the two though:
2010 R36 sedan/wagon: 1679kg/1738kg
2011 V6 Highline sedan (wagon): 1681kg(+2kg)/1747kg(+9kg)
The sticker inside the fuel filler on mine has 98 in big numbers with 95 in smaller numbers.
According to the Australian sales brochures, both the 2010 R36 (brochure published Feb 2010) and the 2011 V6 Highline (brochure published 2011) require a minimum of 95RON. No mention of 98RON. Take that as you will.
In my owner's manual, it doesn't say anything about the minimum RON - just that you should not use fuel with a lower octane rating than what is required for your specific engine, and to refer to the sticker on the fuel filler door for the minimum octane levels.
The calipers are blue.
There's no mention of the rotor size in the sales brochures, only that both the R36 and the V6 Highline get ventilated discs front and rear. You'd want the brakes to be beefier though - the nearest equivalent Mazda 6 and Subaru Liberty wagons are at least 150kg or so lighter than the V6 Passats.
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