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Six experimental fuels representative of Canadian future fuel options were tested against a reference fuel in a Bombardier 12 cylinder, 4 stroke, 3000 hp, medium speed diesel. The reference fuel was a straight run ASTM #2-D. The first test fuel blend consisted of heavy atmospheric gas oil that extended the distillation range (higher end point) of the other blend component ASTM #2-D. The second fuel was a blend of a distillate cut from a mixture of conventional and tar sands crude with hydrogen treated cracked stock. This provided a fuel with substantial levels of aromatic and cracked components. The third fuel was gas oil side stream: a low cetane number, high aromatics level tar sands distillate. The fourth fuel was an equal portion blend of tar sands crude components, gas oil side-stream and heavy unifined gas oil. The fifth fuel was a blend of ASTM #2-D heating oil and a substantial portion of stabilized cracked stock.