All car manufacturers recommended tyre pressures are for comfort....Not for tyre life.....Car manufacturers don't care how long the tyres last.
Start @38psi, and keep an eye on the rears....If both edges start feathering after 3-5,000 kays, add another 2 psi....If the centre starts to wear more than the edges, drop 2 psi....
Unfortunately, you'll have to keep an eye on them for a while, to make the judgement on what is the best pressure for your driving style because everyones driving style is different....Make sure you use your own pressure gauge as every gauge reads differently