Okay here's the question, why does highway driving seem to result in more oil consumption. I drive a V6 Accord that normally burns a little more than half a quart in 7,500 miles. I recently completed a 1,500 mile round trip and found that my car burned almost a half a quart of PP. Is there something about sustained highway driving at ~ 80 mph / 2500 in top gear that increases the rate of oil consumption? I always thought that highway driving was easy on motor oil.