Dueler Alenzas

[KzooZ66]

Am I the only 02 Z66 rolling stock 17s with Alenzas?  I ask this question because I think my speedometer is a little off and only recently noticed this when driving in a little caravan.  Speed was lower than other car.  Could not do the measured mile yet?  Kind of tough in the dark...

What does anybody run for pressure on these tires?  Stock recommendation or higher.  Unfortunately when I bought these there was no recommended pressure from Bridgestone.  I checked tire rack and did not find anything helpful other than a max pressure.

Thanks!