(Portland, OR)  --  Blood and platelet donations are down 20-percent this summer and the Red Cross is urging you to sign up to donate.  They especially need type O negative donors, but all types are needed.  Everyone who donates during August will be registered for a chance to win gas for a year, up to six-thousand dollars.  There will be three winners.  All donors in August will receive a 10-dollar e-gift card.