Took the car for abit of an test, don't know if its the tyres or the lower profiles but ride and handing has improved. Also did not have the TCS come in once even when I pushed it alittle harder than usual, but then I've only had the TCS come in once before and that was in the rain and on a big roundabout
The speedo won't be accurate though....
at 30 and 40 i've spotted no difference with other cars. Easily checked when going through speed cameras
How can you tell?