We have had gasoline price drops several times over the last few decades. I don’t find any history of economic boom from then.
The reality is, the price drop in oil, is the same reason copper is also at a 5 year. Declines in global economy, particularly Europe and Asia, are going to cause more problems that the hopes of gasoline prices will solve.
Also, the oil/gas industry in the US has been a significant growth for jobs outside direct oil/gas hires. There will be more total loss from that, than gains from low gasoline prices. As it has each time we had gasoline price drops before.
I don,t recall any economic booms immediately following a sharp rise in energy prices.