The Versa is the least expensive new car in its class for that very reason. Even minor details cost the company money to design, produce, and get approved. New tail lights? You have to get designers, pre production, models, final production, and then get them approved by the DOT. That is assuming it is the exact same shape/dimensions as the old ones. You can't do any modifications without costing the company money and manpower....and on such a vehicle that produces negligible profit there is no logical reason to do such.My point with the differences between the first model year 07, and the 2012 is that virtually nothing has been upgraded or improved or revised on the Versa. Most cars usually go through some minor tweaks to the grill, headlights or tailights, but not the V. The car has been somewhat neglected by Nissan.
I didn't understand the "upgrade" to a higher tire inflation recommendation, as the Versa already has a terrible ride that is only made a little worse with more air in the tires. It is not like the Versa is a heavy car and needs a stiffer tire to carry the load. Maybe Nissan was trying to get a bit more fuel mileage out of a car that is below average in its class for gas mileage.
The lack of "updating" has kept the costs down and that is why people buy these vehicles.
As far as tire pressure it simply has to do with fuel mileage. Nothing more. I think that getting 38mpg on the interstate is very impressive