Subject:Drained gas tank Date:Sat Nov 17 15:45:04 2012
I've drained the gas tank on the Hummer and it will sit for the next 5 months in an unheated garage (the boss says there's no room in the house).

What do the experts suggest to lessen condensation/corrosion in the tank;
do I leave the gas cap off so air can circulate in tank;
or do I close petcock and put cap on tight?