This document summarizes an experimental investigation of a diesel engine fueled with blends of tyre pyrolysis oil and diesel. Tyre pyrolysis oil was derived from waste automobile tires through a vacuum pyrolysis process. Tests were conducted to evaluate the performance and emissions of a single cylinder direct injection diesel engine operated on blends containing 5%, 15%, 25%, 50%, 75% and 85% tyre pyrolysis oil mixed with diesel fuel. The best performing blends were found to be 50% and 75% tyre pyrolysis oil with diesel. The document provides background on tyre pyrolysis and the properties and production of tyre pyrolysis oil. It also summarizes other research on using alternative fuels in diesel engines.