Energy Transfer has produced a monster total return over the last five years.Energy Transfer (ET 1.43%) is one of the largest energy midstream companies in the country. The master limited partnership (MLP) operates over 140,000 miles of pipelines that transport fossil fuels from production basins to end markets. Here's a look at how units of the MLP have performed versus the S&P 500 over the past five years and what has helped fuel its returns. Energy Transfer's five-year performanceAs the table below shows ...