rpms or boost?

[John Cassidy/Sallyann Mulcahy]

Ok, I know I may start a war here, and that is definately not my
intention.  What would you esteemed listers think is better in terms of
economy and wear and tear, boost vrs. rpms?

There is a 4 mile hill I climb many times a week in a chipped '87
5ktqa.  It climbs it easily in 5th at about 2300rpms,  indicating 1.1
bar.  I can gear down to 4th, around 3100rpm, and boost drops to
0.6-0.7.

The reason I ask is because I linked to a picture of a glowing red turbo
from here last month.  The caption stated that the car wasn't being
driven hard.  Really makes me wish for an oil temp guage!

Thanks for your educated imput! (And I've always used Mobil 1!)

JC