Soaring gas prices and weaker job prospects made Americans gloomier about the economy in April, sending a widely watched measure of consumer sentiment to a five-year low, a private research group said Tuesday. The New York-based Conference Board said that its Consumer Confidence Index, which had plummeted in March, fell again to 62.3 in April, down from the revised 65.9 last month and 76.4 in February. The number was in line with the consensus estimate of 62 from Wall Street economists surveyed by Thomson/IFR, but the index remains at its weakest point since March 2003, when it registered 61.4, ahead of the US invasion of Iraq. “This continued weakening suggests that not only has the feeble level of growth in the first quarter spilled over into the second quarter, but the economic conditions may have slowed even further,” Lynn Franco, director of the Conference Board Consumer Research Center, said in a statement.