Hey guys, i'll be going on vacation soon and wanted to know if i should do anything to my car, i'll be gone for three weeks. I don't think three weeks is long enough for anything to happen to the car but i just thought i'd ask. Also i've heard that i should fill up on gas to a full tank so condensation doesn't build up in the tank if it was 1/2 or 1/4 tank, is this true?