Yahoo's customer satisfaction score of 79 on the ACSI's 100-point scale rose almost 4% this year, while Google slipped 3.7% to 78, its second yearly decline in a row.
Ask.com, with a score of 75, posted this year's biggest increase and AOL.com the biggest decline, down more than 9% to 67. MSN.com, with a 75 score, is up only one point this year.
The annual ACSI e-business report includes customer-satisfaction measurements of search engines and portals as well as online news and information sites.
"Even more important than Yahoo's first lead over Google is the trend of their scores moving in opposite directions," said Larry Freed, president and chief executive of ForeSee Results, which sponsors the ACSI e-business report. "Since the ACSI is a leading indicator of financial performance on the macro scale and at the company level, we may see a real turnaround for Yahoo in the next year."