I was looking at the 1998 Ford E-350 Owner Guide :
It shows to use " regular " unleaded gasoline , 87 octane for the 4.2 L V6 ,
4.6 and 5.4 V8's , 6.8 liter V10 gasoline engines
So the answer would be ( No )
According to the 1998 Ford Taurus Owner Guide : There was not a flex fuel version of the 3.0 liter " Vulcan " engine offered on the 1998 Ford Taurus
in the tank
The 2009 Ford Flex runs on regular unleaded.
The 2014 Ford Flex runs on regular unleaded.
The 2010 Ford Flex runs on regular unleaded.
The 2011 Ford Flex runs on regular unleaded.
The 2012 Ford Flex runs on regular unleaded.
The 2013 Ford Flex runs on regular unleaded.
Electrical
Yes
It is important to know the fuel economy of a car while owning it. The fuel economy of a Ford E350 is 14 mpg city and 18 mpg highway.
in the tank.