In Australia you can get your tires filled with nitrogen for $25 for all wheels for the life of the tires. Nitrogen is nowhere near affected by heat or cold, so it wont set off your TPM, plus it doesn't "leak" as much as air so there is no need to check pressures constantly. I've now done close to 40,000km on the Bridgestone RFTs supplied with car, never had a TPM alert and check the pressures every few months and seldom need to top up the nitro. Use it on my other cars too.
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