HELP! Extremely bad MPG!!

[juancasilva]

Have you actually done a good old fashioned fill it till full, record mileage, use down to 1/4 tank, record mileage and fill it till full and record gallons and then divide?

Don't assume the computer is 100% correct. They calculate AVMPG and distance to empty based upon the injector pulses (and maybe even more) and are not perfect.

Not yet, actually I was trying to figure the manual calculation method. I will be back with my reading.thanks for the advice

 

[juancasilva]

The pulse widths are usually controlled by banks (left and right side of the motor). This is related to the fact that there are two oxygen sensors to use as feedback loops.



If I was concerned about a bad injector or debris in the screens... First thing I would do is use a scanner of some sort to check long term fuel trims...

Another thing I would check (as I've heard of these having major mpg impact on 1grFe with no lights...) is the PCV valve. Just replace it, since it is so cheap.

Finally, hand calculate your MPG to get real data.

Also, what is up with a 2.5" body lift. That is pretty much impossible on a 5th gen. Did you mean suspension lift?

I guess it was a suspension lift. this kinf of is what I installed.

Toyota 4Runner 3" + 2" Full Lift Leveling Kit 2WD 4WD PRO 2003-2014 | eBay

I will try the PCV change.

Thanks

 

[flyrv9]

On our 4700 road trip last year from Kansas to California, Arizona etc. we recorded miles and gallons and did the math. In every case we got better numbers via calculation than from the read out.

 

[wfo9]

On our 4700 road trip last year from Kansas to California, Arizona etc. we recorded miles and gallons and did the math. In every case we got better numbers via calculation than from the read out.

The best method (once you change tire size) Is to use a GPS to get your distance traveled. The OD is close enough until you go over 33" tires.