Bad mpg

Anyone know what’s up ? So I’ve been getting 11mpg on the highway 2004 2rz 2.4 which is horrible , I’ve got no check engine lights , i replaced the post cat o2 sensor a year ago , I do have bigger tires but I’ve had them for about 2 years (mpg is horrible now )I also take it easy on the pedal ,
Where should I start ?

 

That's not great. Simple stuff first...rolls good in neutral? I.e. nothing binding?... motor compression good? Manual or Auto trans? Intake system clean?
Exhaust good, and clear?

 

I have a 2nd Gen RC 2WD 2.7L/auto and I get like 18 MPG. I thought my mileage was bad! Definitely sounds like something is wrong!

 

I’ve been good on maintenance , I got a new air filter , throttle body cleaned , plugs changed months ago, new PCv valve it’s an auto single cab , this has been going on for a while now

 

Mileage?

 

180k

 

Check the compression of the motor....also, have the transmission looked at. Slipping transmissions are death on mpg

 

I'm thinking transmission here.

 

my transmission does shift funny from time to time , hmm

 

Worth looking into it. At 180 k the old auto trans doesn't owe you a whole lot...especially if it's never given you grief.

 

Thanks for the input , I didn’t think of the transmission

 

More than welcome...report back if you solve it!

 

Another thing to check is making sure the torque converter is locking. If it isn't that will eat your milage too.

 

Yup, what I was thinking. Transmission stuff.

 

A non locking torque converter can be entirely electrical too.

 

Completely true that.

 

Auto transmissions have always been a mystery to me...worse now, that they're all computer controlled.

 

do a couple drain & fills once you check the fluid. can even drop the pan and check the screen/filter

 

Fortiz619 I just did the transmission filter change over the weekend. If you decide to take the "red" pill there is also a link in my post to Timmy's video which is extremely helpful.



https://www.tacomaworld.com/threads/transmission-filter-change-lots-of-pics.636961/

 

My MPG has tanked really bad as well, I do not look forward to having to do any tranny work if the issue is there. Here is to hoping increasing tire pressure and changing plugs gets me back to normal.