When i first bought my car in 2012 with 18k miles on it. I used to be able to set cruise control on 67/68 and average 26/27 mpg on my commute to work.

Now 70k miles later, same commute, same speed, im avg 20/21 mpg...

Anybody have a clue to why? Still using 93 octane, R2C filters look clean.

Anything i can do to increase my mpg?

 

Tire pressure, spark plugs and ECM reset come to mind to start with.

 

also, it might be time to clean out the throttle bodies and MAF sensors... very easy to do prior to the ECM/idle reset....

 

How do i clean the MAF sensor, jusy pull it out and clean it or? And also have done multiple ecu resets and no improvemt, psi is at 35.

 

^ yes, unplug the top connectors and unscrew the small screws. Take out the MAF and spray with MAF cleaner (CRC MAF cleaner), let air dry then re-install. I do one at a time... Here's a video - different car but same concept.

 

You need a tune up then an ECM reset. Wouldn't hurt to clean the MAF, O2 sensors, throttle body and injectors as well. Doing all that will bring you back to 24-26 mpg.

 

Mine seems to lose a few MPG in the winter.

Fuel?

Summer-Blend vs Winter-Blend Gasoline: What?s the Difference?

 

Just pulled it out, what am i exactly sparying tho?? Both sides? Or just the little opening on the bottom???

 

I would suggest NOT messing with your throttle bodies. I cleaned mine and it made the car have a surging idle for like a week and a half until it finally relearend the positions. The car was nearly undrivable.

 

I dont think im going to just cleaned the sensors and re installed now going to let dry, discoinected the battery to do reset aswell

 

I'll update in a few, gona go for a quick drive on the highway. Question tho, after resetting ECU, am i supposed to drive the car hard? Or? Explanation please

 

Interesting, good be a combo of both? Who knows?????

 

That's up to you. Your ECU will begin to adapt to how you drive. So if you drive it hard right after the reset for a while, you'll start to notice that your throttle feels more sensitive. Or vice versa, accelerate gradually and the throttle will lose sensitivity.
It's too bad you have to choose either or... Wish Infiniti would have just added a "Sport" mode feature like many newer cars to always have the best of both

 

Went on a little beat run, notice a little increase in throttle response. Set the cruise control on 80 in 7th gear(Manual Mode), on a little incline was recording 25 MPG sooo hopefully it will be atound 28 at 67

 

Yep, whatever % of ethanol is added will pretty much be how much less % mpg you'll get over non ethanol fuel. So if you were getting 30 mpg w/ non Ethanol gas you'll get 27 or less w/ a 10% Ethanol mix.

Also, are you using the dash mpg calculator or going by true mpg after going through actual gas used, it can be a dramatic difference sometimes.