Did some A road driving last weekend speeds generally between 40 and 60 and was shocked to see the onboard computer showing 34mpg over the 45 odd miles of the round trip. I had reset the MPG before setting off as well as making sure my tyres were at 33 and 36 PSI. That's a record in this car. Now I know some of it's down to the fact that the tyres are new so the cirucmference of the wheels is slightly larger than the part worn old tyres. Plus the fronts are now 225/40's rather than 215/40s so have a further 4mm greater sidewall hight and so even greater circumference. But that shouldnt add up to the difference from the (at best 28 mpg) figures i was getting with the old tyres. Should it?
So in summary so far:
It might be at least part to the slight change made when i had my alignment done but overall the car definitely feels more planted at 60 than it did prior to the change. But i think a good part of it is the tyres.
There's a notible improvement in comfort over typical london roads. The ride is far less rough and "noisy" (feel wise not noise wise), making roads that used to let you know they weren't perfect feel relatively smooth. On actual smooth roads its like the car is gliding over the road now.
The general feel from the tyres is so much better, actually get a sense of some rubber between car and road now rather than solid wheels. Makes the car far more confidence inspiring in corners.
Initial turn in just off the dead ahead is very slightly slower than the RFTs, but now i'm used to it at anything above 30-40 mph it's actually a good thing. The car responds to direction changes at faster speeds perfectly in my opinion, and has lost a touch of nervousness it had. I find myself more relaxed at the wheel now on A road and Motorway speeds.
I get no sense of mushyness from the steering once in the corner either, car responds quickly and stably to steering adjustments in sweeping corners.
Tramlining has completely disappeared. Despite the increase in front tyre width.
Steering wheel is more stable over uneven surfaces, where before it would move around with every little bump etc
They are so much quieter than the RFTs! On smooth roads I can hardly hear them with the windows up. Almost makes it fee like i'm driving a limo in that sense
Grip is (unsurprisingly) higher, so much so that painted mini roundabouts now fail to get the traction control light to flicker, similarly accelearating over small manhole covers results in nothing too.
Fuel economy seems (surprisingly) to be better.
So far there's not been a single downside, for me at least.
Plus all of the above has been in winter conditions with the temp rarely being over 10 deg and as low as 1 and as often as not wet. In terms of grip they're feeling like the runflats did (better even) on dry summer days.