[eye30]

I have 32 all round. Manufacturers rec.

Reason - If in accident then insurers can't reject claim.

[asathorny]

I run 36 psi on 195-65/15, no problems... 

Yup, me too

[Surferdude]

36 is fine regardless of the size.
But I think some of the diesel guys run 38 or 40 for the engine weight as you suggest.
If I had a diesel, I'd run 40 front and 36 rear.

[Dazzler]

Welcome Dave, A bit of a "fang' from time to time doesn't seem to hurt the fuel economy in the diesel. (from past experience)