Cheers for that seems it not effecting all cars some are spot on other cars are way off so seems to be a game/telementry issue.Try this formula, where you have to change ${mWheel} by the correct value for each wheel
JavaScript:const zero = 273.15; const t4 = $prop(`GameRawData.CurrentPlayerTelemetry.${mWheel}.mTireCarcassTemperature`) - zero; const t1 = $prop(`GameRawData.CurrentPlayerTelemetry.${mWheel}.mTireInnerLayerTemperature01`) - zero; const t2 = $prop(`GameRawData.CurrentPlayerTelemetry.${mWheel}.mTireInnerLayerTemperature02`) - zero; const t3 = $prop(`GameRawData.CurrentPlayerTelemetry.${mWheel}.mTireInnerLayerTemperature03`) - zero; return t4*0.34 + t1*0.22 + t2*0.22 + t3*0.22;