Okay, so here's the story, believe it or not, but this is my experience.
A couple of months ago I changed out the the headlamp bulbs on my X (2010 SE 4x4). I disconnected the negative battery terminal, changed the lights, got side-tracked for a while and went back about half an hour later and re-hooked up the battery, and lived life as I normally would . . . boringly.
In the month that passed I noticed that my MPGs had dropped dramatically as I was getting about 200 miles per tankful, or 11MPG (I was getting combined of about 17-18 before this.)
WTF?
So I checked on here (yup, I did a search) and read numerous posts about resetting the ECU. It struck me as B.S. so I did not do it and decided to give the vehicle a couple more tankfuls to see if anything improved.
It didn't.
So, as the countryside is not far from where I live, I went out into the deepest, darkest, parts of the great 'Merican Outback and did the following.
I disconnected the negative battery terminal.
I waited 30 minutes.
I hooked it back up.
I drove at 55-60MPH, not exceeding 2000 RPM on my climb to 60, and not exceeding 2000 RPM while cursing.
Once at 60 I set the cruise control and then drove as long as I could until I had to stop, which came out to about 20 or 25 minutes.
I did not check the mileage on that tank of gas.
After I got down to a 1/4 tank, I filed up and started keeping track of the mileage.
First tankful 15.8MPG
Second tankful 16.7MPG
This most recent tankful 18.1MPG
And I'm pretty sure we're on winter blend now.
So, I'm here to say that based on my experience, although I didn't believe it would work, doing the ECU reset thing actually worked and I got my MPGs back to normal.
(Your experience may vary). (No other changes to the vehicle were done. Everything is the same as it has always been.)
A couple of months ago I changed out the the headlamp bulbs on my X (2010 SE 4x4). I disconnected the negative battery terminal, changed the lights, got side-tracked for a while and went back about half an hour later and re-hooked up the battery, and lived life as I normally would . . . boringly.
In the month that passed I noticed that my MPGs had dropped dramatically as I was getting about 200 miles per tankful, or 11MPG (I was getting combined of about 17-18 before this.)
WTF?
So I checked on here (yup, I did a search) and read numerous posts about resetting the ECU. It struck me as B.S. so I did not do it and decided to give the vehicle a couple more tankfuls to see if anything improved.
It didn't.
So, as the countryside is not far from where I live, I went out into the deepest, darkest, parts of the great 'Merican Outback and did the following.
I disconnected the negative battery terminal.
I waited 30 minutes.
I hooked it back up.
I drove at 55-60MPH, not exceeding 2000 RPM on my climb to 60, and not exceeding 2000 RPM while cursing.
Once at 60 I set the cruise control and then drove as long as I could until I had to stop, which came out to about 20 or 25 minutes.
I did not check the mileage on that tank of gas.
After I got down to a 1/4 tank, I filed up and started keeping track of the mileage.
First tankful 15.8MPG
Second tankful 16.7MPG
This most recent tankful 18.1MPG
And I'm pretty sure we're on winter blend now.
So, I'm here to say that based on my experience, although I didn't believe it would work, doing the ECU reset thing actually worked and I got my MPGs back to normal.
(Your experience may vary). (No other changes to the vehicle were done. Everything is the same as it has always been.)
