Hi! I recently got a '19 Avalon XLE with 58k miles, everything was going perfect until recently, at 61k miles, I got a Check Engine light on the dash. Car drove fine, sounded fine, but I took it in for service immediately. The dealer’s service center said that it was a faulty fuel purge valve (and maybe also mentioned a fuel cap?).

The problem parts were replaced, but since then the car has been getting absolutely awful gas mileage. A full tank gets maybe 200-220 miles, and in the city we’re getting between 11-13 MPG. On the highway I’ll get maybe 22 MPG if I’m lucky, with like 15 MPG combined. Before this, we’d easily hit 31 or 32 on the highway, and average of 24. I drive super gentle and always try to maximise fuel efficiency.

Has anyone else experienced similar issues? Does this sound like the dealership did not properly replace the part? It’s weird that the problem would only arise after having the check engine light dealt with.

How much do you get on a full tank? I know the Avalon has a rather small fuel tank, but I used to get 340 miles+ when driving on the highway. ~200 is crazy low.

Appreciate any advice