I have a very steep driveway that will scrape the front plastic a bit - foresee any problems?

If you went up a tire size the scrapping might stop but there is not a lot of room in the wheel wells for larger tires so check clearances before changing tire sizes.

That's a surprise, eh, given the CT's already too-tall architecture. If what's on it are 225/5517 try 225/60/17 (from 2010-2014 OBs) to grab a half inch. Stay with H or V-rated to prevent soft sidewall squish of S or T tires negating your purpose! If OE is already 60 series then I'd say you'd have to start over with 18" wheels as 65 series truck tires on your CT will seriously screw up its reasonable handling. Avoid going wider to prevent fender rub up front too.

225/60/17 - confirm has not issue on the wheel arc as I am using this spec tyres. Only issue is the speedometer is showing 3% slower than your actual speed.

G’day GuruZ75RS do you think the larger tyre size is making an already sluggish car off the mark much less responsive and this larger tyre size would increase the load/wear on the 2.0i engine?

There would be NO additional wear on the motor. You might not feel any gearing change as the CVT accommodates all ratios. But you ARE making it even more sluggish!

My point about 2017/18 model is that they come with 225/60 tyre.

225/60R16 or 17? I suspect they're fairly tall already if on 17" wheels. You absolutely WILL compromise the handling by going up to 225/65R17 (Outback sized in North America); I would NOT do that! If you've the old smaller 16" wheels then indeed I'd try 17" as they should fit fine.

They are all 17” standard I’m not looking to change wheels just tyres. I am aware the 60 will fit my 2013 model. Although wanted to know someone’s experience with running the 225/60r17 on earlier model. So do you own a 2013 Subaru XV running 225/60 tyres? Obviously any larger diameter tyre will increase load on drivetrain, gearbox and engine if it needs to rev a lot harder to get going. I already know it will be less responsive acceleration from stop, although not being in aggressive driving situations I doubt that will be a problem. So has anyone got an update running this size tyre all round on earlier model? I have noted that 2013 XV (actually come out with 225/55r17) engine spec is 110kw@6000rpm & 196Nm@4000rpm and the newer 2017/18 model (actually come out with 225/60r17) engine spec is 115kw@6000rpm & 196Nm@4000rpm so difference is +5kw only.

Preemptive strike: if OE on yours is 225/55R17 (like 2000-2004 NA OB et al), adding 0.5" ground clearance with 225/60R17 will be hardly noticeable on the driveline. Try to get H- rated rather than T to keep handling crisp. I like the value and fine performance of the OHTSU 225/60R17 V-rated.