The basic problem, and why this subject attracts so much attention is that there is no such thing as "optimum" tyre pressure.
Tyre pressure is a compromise between ride, adhesion, handling, fuel consumption, and tyre life. You can work out the optimum pressure for any one of these, but it is fair to say that all these "optimums" will be different, so you will have to compromise. And this is where the arguments start. And keep going, since there is no such thing as a single answer!
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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