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No , the engines are not designed to use e85 in a 1971 Ford F-150
no
The 2002 Ford Explorer runs on flex-fuel (unleaded/E85).
The 2012 Ford Expedition runs on flex-fuel (unleaded/E85).
The 2013 Ford Focus runs on flex-fuel (unleaded/E85).
The 2013 Ford Taurus runs on flex-fuel (unleaded/E85).
The 2014 Ford Focus runs on flex-fuel (unleaded/E85).
The 2013 Ford Expedition runs on flex-fuel (unleaded/E85).
The 2014 Ford Expedition runs on flex-fuel (unleaded/E85).
The 2012 Ford Focus runs on flex-fuel (unleaded/E85).
The 2013 Ford Explorer runs on flex-fuel (unleaded/E85).
The 2014 Ford Taurus runs on flex-fuel (unleaded/E85).