AP Photo NEW HAVEN, Conn. (AP) — The black-and-white photo on the wall of Jennifer Tracey-Carlo’s heating oil company shows her father and grandfather standing beside a small fleet of gleaming delivery trucks, offering a glimpse into a time when oil was king and honoring the two men who built the business. Tracey-Carlo, the third generation to run Tracey Energy Services in New Haven, says oil dealerships like hers once expanded with a growing population and followed the exodus to suburbia. “We have their grandchildren,” she said of customers whose families grew up with hers. “As people moved further, we’d move with them.” Now, the industry faces a relentless boom in cheaper natural gas, on top of a more than 50 percent drop in the number of homes heated by oil between 1973 and 2011. The threat to the industry dominated by family businesses is particularly keen in the […]