DETROIT (Reuters) - General Motors Co and Ford Motor Co both reported weaker-than-expected U.S. sales gains in June as they again dialed back deals for car buyers despite the shaky economy. (http://feeds.feedburner.com/~ff/reuters/topNews?d=yIl2AUoC8zA) (http://feeds.feedburner.com/~ff/reuters/topNews?i=V2kr7-dp_6k:6QBQKTb8uY0:V_sGLiPBpWU) (http://feeds.feedburner.com/~ff/reuters/topNews?i=V2kr7-dp_6k:6QBQKTb8uY0:-BTjWOF_DHI) (http://feeds.feedburner.com/~r/reuters/topNews/~4/V2kr7-dp_6k)