Save the sparingly used spare . If you keep it inflated, it could last you this change of tyres. Then next cycle, change the spare also, as it would have completed ~6 years (mfrs recommend to change tyres regardless of condition in 5 years time). Mostly you will change your car by then 
Keeping tyres properly inflated will help tyres last longer. My set of XM1 is wearing pretty well, at ~30k now, and I expect at least 10-15k kms more out of them. Secret - baby your tyres, but inflate mercilessly!
While you change tyres, try and wring out some money from the old tyres - the dealer seem to buy them back for a token amount to sweeten the deal. Let us know if it succeeds.
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