Maintenance cost on 2017 Ford Focus RS
Take the maintenance schedule to your mechanic and ask them for prices.
$200 CAD for an oil change at the dealer, every 16 000 km (10k Miles) or so. You're looking at about half that if you do it yourself. That's an oil change about every 9-10 months or so. Also tire swapping cost if you're not doing it yourself.
Just to add to this, you should change your oil every 10k KM 6-7k miles. I just did my first oil change after about 16k km and the oil was filthy, just black. I will be making changes every 6 months now or 10k KM. I also started using AMSoil 5w-50 Signature Series fully synthetic.