I thought as well that reduced thrust would be used in most cases in all aircraft types. However, I was flying with a friend of mine in a Cessna 172, taking off from a 6900 foot runway and he used maximum power - we were in the air after rolling roughly 500 feet. I asked him about this, and he said that's what he has been taught to do, that it is safer to use maximum power and be in the air ASAP. Is this because it is a single-engine aircraft?