Hello everyone, my 2007 Acura tl gets bad gas mileage now. This has been going on for 2 months now. I'm bot sure if I should change the air filter, get new spark plugs, change the o2 sensor, or get a fuel injection cleaner additive or get the whole throttle body cleaned out. I got 44k miles and I bought the car new in nov 2006. I would average about 17 in the city and now I'm averaging 12-14 and I do not drive agressive. What do u guys think?

 

What are your driving conditions like? A lot of stop and go?

 

x2 a lot of it depends on your driving atmosphere. I know you said city driving, but that can range from cruising at 35 mph to rush hour idling.

But I'd do a transmission fluid drain and fill, check the air filter and 02 sensor just in case. I don't think you'll need new spark plugs, the ones in are good for about 100k.

 

I'm about 40% highway 60% stop and go. I'm in NYC do traffic can get bad but it moves. It's very cold here.

 

That's the answer.

 

The cold air is denser and thus gets mixed with more fuel, but you've had the car for several years and never had this issue in past winters?

It could be the gas as well, you're not filling up with E85 without realizing it, right? That would be hard to do. But even regular gas is now E10 in most places, I think. This will net you lower gas mileage.

 

tire pressure can have significant impact

 

did u recently get new tires?