Not adding much to the discussion, but I've always felt its a bit miserly and penny pinching working out tyre cost, miles per gallon and "I can change my own oil", after all you're buying at £40k+ luxury branded car!
Fill up when needed, replace tyres when they reach the legal limit, service as required. Enjoy your premium purchase and relax.
If I wanted to worry about all those trivial things I'm have bought a JAAAG, and an AA rescue subscription 😂