Hey Scott hope you got any insight when I first started driving this 2013 ford fiesta single owner vehicle the car would get almost 400 miles to empty over the last couple months I've realized it's gotten less efficient until I really noticed I'm now getting 280 on a full tank but here's what I'm really troubled last time I put gas like 2 days ago I was at half a tank or so it said I gave ten that should have gobbled it up but it stopped at 6 bucks then I got in the car I only got a qtr tank more so I went back forced another 4 like you say not to and it still didn't get to full full on the needle anything you got would be great got injector cleaner the Lucas one and I bought a new air filter since I was told it's never been changed filter looked great when removed so I kept it just because it ain't busted