As the known reserves of natural petroleum-base gasoline diminish, synthetic full boiling range gasolines will assume a strategic importance. Gasolines from oil shale and coal will be prime candidates for replacing the petroleum-base fuel. In this paper, a shale derived, high paraffin gasoline is compared with a standard petroleum base fuel with respect to in-cylinder combustion characteristics, and overall power and emissions data. The results show that the performance of the synthetic fuel is comparable with the petroleum base fuel. However, optimization of engine combustion parameters for the synthetic shale blend gasoline is necessary to take full advantage of the synthetic fuel.