You may use 225/45R18 size. Many have changed to this size.
215/45R18 Continental MC6 have this size.

mind to share what is the expected delivery date for mazda 3 now? thanks.

Yes it won't turn, tested it the other day.

Is it the tyre or suspension?

I changed mine to hankook v12evo2, differences are noticeable. All roads surfaces sounded like newly paved roads on the factory fitted tyres. My radio volume now turned down by 2 points on my favourite channel and can talk with passengers without raising my voice a lot now. Wind noise exceeds tyre noise by around 130km/h, when previously the toyo so damn noisy after 60km/h. Very surprised that it made such a difference.

Rolling resistance also a little lower, so can improve acceleration and fuel consumption a little bit. It really changed the driving refinement in city speeds quite drastically.

If you can wait a little longer to change (after september), i would suggest the soon to be released falken fk510 which has even better rolling refinement rating than the v12evo2 while selling around similar price range.

So my rant to mazda : Please rid yourself of fitting toyo tyres at factory. If you want to support japan products because you're japan company, fit it with falken fk510. It is cheaper yet better than the toyo in both price and performance metrics!!! 
it is about RM1800 if refer australian website, but likely around 2500~3000 when installed. Seriously considering this but not in a hurry at the moment. Thinking of maybe changing it on the 5th year of ownership.

The kruk kruk noise can also be contributed by :
1) the strut bearing
2) the strut mounting
3) the top of the coil spring hitting the strut mounting
4) brake caliper movement

For me, i've done warranty claim on parts 1 to 3, but didn't resolve till date. Point 4 was discovered by a neighbourhood small franchised dealer. The mechanic there dismantled the front caliper and added more lube on the caliper pins and the pin chambers. It reduced the noise occurrence drastically, but only for a short 1 to 2 months period    Seems like a similar incident to a number of previous generation's mazda3 due to caliper pin design. Not sure whether this is an issue to the facelifted GVC version.

is normal, esp when engine is really hot

just had the same thing last week . really short drive but perhaps nowdays really hot outside.
googled a couple of minutes to know that its normal. didnt know that before that the m3 engine has this kind of function
thought only for turbo car.

If within warranty, better stick to berjaya sompo.

The benefit of using berjaya sompo is that you can go straight to mazda's own body/panel workshop, not some external 3rd party frequently used by other insurance. Claim also easier if within 15k and they also have their own adjusters. In short, quality assured of the workmanship.

If renew directly at their insurance office, i think got additional 10% discount. But that was last year's info, maybe it changed.

u may be asking about the old mazda 3 with different software configuration?  this is the newer not launched thread mate

I think you are allowed one free update and then you got to pay for it. Not worth it in my opinion.

I don't know about Mazda 3, but for CX-5 with MZD, the SC will only assist to update the MZD firmware but for the map update, they ask us to download Mazda Toolbox, register online for the support and update the map ourselves.