An internal General Motors Corp. report shows a quarter of U.S. consumers avoid the largest automaker's vehicles because of reliability concerns, even though complaints by new-car owners fell 10 percent in the past year, according to a Bloomberg News story by John Lippert. The review, presented by some division heads to other managers in April, touched on several quality measures, including a last-place finish in April's Consumer Reports magazine ranking on reliability. GM is taking steps to improve quality and shoppers' perceptions as it prepares to replace 43 percent of its models next year -- its busiest ever for new or redesigned vehicles. General Motors' market share has slipped to less than 30 percent from 50 percent four decades ago as rivals including Toyota Motor Corp. continue to build sales on a reputation for quality.