thank you all for the help. i've posted the last few top offs (not as accurate as full tank but for my purposes accurate enough. i also use the same pump as much as possible when i top off) i got up to 55mpg from 47-49 by eoc. tonight i drove about 170miles trying some pulse and glide and when i topped off i got 51mpg
i'm pretty sure it was because i was forced to use a different pump and i could hear that it did fill up further into the neck than the pump i usually use. oh well, i'm sure some friend will need me to be their DD again sometime soon lol
thank you all again for your help, i'm really glad i found this forum. peoples jaws drop when i tell them i get around 50mpg lol like its some amazingly impossible thing to do