Prices rose 0.8% on a seasonally adjusted basis between March and April — also more than analysts had expected. The biggest driver of last month’s inflation jump was a steep 10% increase in used cars and truck prices. Over the past year, used car prices rose 21%. Clearly people are willing to travel again, and businesses in the industry are responding with price increases after a year of operating on a very limited scale. But the longer price increases persist, the more attention the Fed will have to pay to them.