I drive the limit because my mileage drops quickly at higher speeds and frankly, I'm almost never in a hurry. Speeding on an interstate is pointless. If I want to go "fast", it's on a twisty mountain road where the limit is probably 45 or less and fast is a very relative thing. And on a tangent, I never know what to say when someone thanks me for my service, except maybe "it was my pleasure" because what else would you say about being in the Marines?