The biggest differential between ambient and tyre temperature I ever managed in my last BMW was 23 degrees. In the Merc I haven’t got near that…different tyres and a more relaxed drive I guess. The temperature of the tyres rises by 10 degrees pretty quickly though, even when driving sedately - it’s a heavy car... But if the car’s capable of showing individual tyre pressures my understanding is it needs the sensors in the valves; the abs sensor version just measures relative differences in rolling radius doesn’t it, and bongs if the difference gets too big?
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