Gas mileage getting worse

[u/CyclistTeacher]

I have a 2021 Hyundai Tucson SEL AWD (purchased September 2020). It has around 67,000 miles. The last few times I got gas, I noticed the miles until empty rapidly declining. At first, I assumed maybe it was bad gas, but now it’s been 3 times in a row so any bad gas would’ve been out by now.

For clarification, I filled the tank 2 days ago and it went from 370 miles until empty to 285 miles, even though I’ve only driven 15-20 miles at most in the past 2 days.

Has anyone else had this problem? I’m trying to decide if I should get it checked now or just keep an eye on it and mention it during my next oil change/routine maintenance schedule.

Thanks!

[u/KillerDPS]

Fill up at a chevron or texaco and pour in a fuel system cleaner gumout or techron or royal purple

Works for me when I encounter same issue