 so my 2005  e-350 5.4 was getting about 18 miles a gal. if i drove nice. so i cant get a answer on the 2009 e- 250 4.6 with the lovely flex \fuel on the back door.  ( miles per gal. ) I have my answer now that i completed 1 full tank ...12 miles per gal. So the green sticker must be the cash flying out of my walllet !