i usually get the 1lb tubes of 96% lean beef at HEB... cook it on the george grill and i'd say most of the fat cooks out.
tonight i actually tried a 1lb ground turkey tube that was 99% lean... that shit sticks to everything (guess b/c basically no fat). once i seasoned it up i put a dab of olive oil on a plate and smashed the pattie onto it, flipped it and smashed the other side onto it. threw it on the george grill and cooked it up. didnt' stick to anything, didn't even have any grease come out of it. didn't taste quite like i expected but it got the job done.
i might try mixing a lb of the turkey with a lb of the lean beef and see how i like that for patties.