ANY car running 25llbs of oil pressure at idle and under braking doesn't need any repair or mods. Oil pressure changes with engine RPM until it gets to a high pressure and bypasses. I wouldn't be concerned if it dropped to 10 at idle. The pressure also changes with the type and weight of the oil. I wouldn't recommend disabling the PCV system on a street car and using just puke tanks. The tanks are more for a drag racing and short intervals. The vacuum, from PCV, in the crankcase will help prevent the "pushing" blowby the rings problem you are having. Don't know an average useage of oil. My doesn't burn any between 4000 mile oil changes with Mobil 1 10-30.
I wouldnt be so quick to say those things:
1. If a car with a normal cruise hot pressure of 40+ PSI suddenly drops to 25 PSI under braking, you can be DAMN sure that the pressure drops way, way, way below 25 pounds for a moment and surges back and forth every time you do that. The Viper gauges are dampened, so you wont actually see the split second drops to zero and spikes back when starvation occurs.
2. Oil Pressure is not neccesarily as important as deviations from what is normal for THAT car. A car that drops from 40 PSI hot idle to 10 PSI hot idle over 10 years is wearing. a car that drops to 10 PSI over night has a BIG problem.
3. A PCV system is nothing more than an emissions control system. With it installed, it will in fact pull MORE blow-by gasses through the rings due to the vacuum in the crank case. If he is ingesting oil through his rings, he is "pulling" oil into his cylinder during the intake stroke where there is a vaccum in the cylinder. The PCV will help this a little, but dont forget, the higher your revs or higher your MAP, the less the PCV system will do until it effictively does nothing, and you can expect this wont count for a whole lot in the real world. Also, the more crank case pressure that goes through the PCV system, the more oil vapor it will be throwing into the intake tract, effectively making it into the combustion chamber anyway. Running a standard breather system on a street car is just fine, and in fact much better in many cases due to the reduction in the amount of ingested oil through the intake tract, and its resulting buildup, hotspot causing and octane reducing properties.
what is average oil consumption for our cars? i have my ccv valve blocked and have the vents off of each valve cover going to a puke tank, which seems to be catching a fair share or oil. what can be done to stop the engine from "pushing" excessive oil? i do have the baffel "trap door kit" installed in my oil pan, which helped stablize my oil pressure under hard breaking. prior to installing that, my pressure would drop to 25-30lbs under hard breaking. all of my driving is spirited street driving. 
