Personally, I go with the flow. I never go slower than the slowest trucks because I feel that creates a dangerous situation for all of us. But I rarely go above the speed limit as I'm cheap and don't like spending all my time in a gas station. The only time that I differ with the truck drivers is in a blinding rainstorm. They sit higher than I and when they pass there "wake" leaves me blind, so I usually just pull off until the storm passes. When I'm on a two-lane and holding up traffic, I pull over at every opportunity to let the buildup behind me pass, be it one or more cars.