Fuel having a high ´natural´ cetane number obtained through high energy paraffin content may provide better fuel mileage than lower energy fuel or fuel with poor natural burning characteristics plus a cetane improver, if ambient temperatures are adequate to prevent gelling of the high paraffin fuel.
By using a directly-injected stratified charge, it was supposed to be the answer to the automobile´s double whammy of emissions controls and fuel mileage requirements.
Fuel mileage ranged from the Spirit´s 42.5-mpg average to the 35.1-mpg average of the Aero.
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