SERIOUS mpg problems
 

ok so last week i decided hmm whats my mpg and it figured out to be 15.8 mpg so pretty much 16- thats terrible for a 2001 v6 so i figured ive been flooring it more then i thought so i made sure not to go over 2000 rpms and i jsut filled my tank up and my mpg got worse!!! 15.2 my dads suburban gets 15.5!!!!!!

someshting reallllyyyy wrong what should i check/ should i bring it somewhere? wtfffffffffff!!! someone help

Fuel filter clean?

This is about the time of year that crappy gas comes out.