How many K's a year do you guys do?

If 98 is 10c a litre more and you do 25,000 Kms at say an average of 10L / 100Km, then it's only costing you around $250 a year more to use 98 octane.

I suppose the decision is up to the individual and whether the benefit (or perceived benefit) from 98 over 95 is worth $250 a year...