One thing not mentioned above is different sizes front and rear. On a standard bike, 60% to 70% of the weight is on the rear wheel, it make sense on pavement to have a narrow front tire, which will make the bike more responsive, and feel faster - though I doubt there is any real speed difference.

One of my commuters has 28-622 tire on front and 35-622 on the rear, another has 32-559 front and 40-559 rear. Pressures are the same front and rear. The wider and taller rear tires provide a bit more cushion.