Google accounted for 64.42 percent of all U.S. searches conducted in the four weeks ending April 2, 2011, while Bing-powered search comprised 30.01 percent of searches, according to Experian Hitwise.

The remaining 69 search engines in the Hitwise Search Engine Analysis report accounted for 5.58 percent of U.S. searches.

Yahoo! Search and Bing achieved the highest success rates in March 2011. This means that for both search engines, more than 80 percent of searches executed resulted in a visit to a Website. Google achieved a success rate of 66 percent.

Longer search queries - five to eight words - were down 3 percent from February 2011 to March 2011. Shorter search queries - those averaging one to four words long - increased 1 percent from February 2011 to March 2011. One-word searches comprised the majority of searches, amounting to 24.40 percent of all queries, a 2 percent increase from February 2011 to March 2011, the research firm said.