pmknowles
Established Member
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- Jun 17, 2023
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- Location
- Richmond Yorkshire
- Driving
- MG4 Trophy LR
Just to clarify some points from above. Tyre pressures are relative to normal atmospheric pressure (1013mbar or 14.7psi) so they do vary dependent on the weather BUT the difference between low and high pressure is +/-40mbar which would give a total range of 80mbar or 1.2psi. most tyre pressure gauges (including TPMS) are only accurate to 1psi (and cheaper ones 3-5psi) so any change in atmospheric pressure is likely to be lower than the accuracy of the sensor.
The manual says 2.5bar (36 psi) all round and 2.8bar (41 psi) on the REARS fully laden.
Under inflation results in higher rolling resistance and wear on the shoulders. Over inflation lower rolling resistance and wear on the centre. The benefit in energy consumption from higher pressure is actually lower than increased cost of replacing the tyres more frequently
The manual says 2.5bar (36 psi) all round and 2.8bar (41 psi) on the REARS fully laden.
Under inflation results in higher rolling resistance and wear on the shoulders. Over inflation lower rolling resistance and wear on the centre. The benefit in energy consumption from higher pressure is actually lower than increased cost of replacing the tyres more frequently