Mpg drop

Also, no lift just stock 4x4 double cab short bed w/ towing package

 

Jack it up and give each wheel a spin by hand. See if you have one dragging more than the others.

 

As stated above, cleaning the maf is not a terrible idea

 

An often overlooked item is the radiator cap. If it doesn't hold enough pressure, you can get problems. Not a common Toyota problem, but a cheap fix if it is the problem. I've seen new ones on other makes that caused the coolant to boil at too low a temperature.

 

So went out on lunch break and drove a bit to check the brakes. Driving down a straight stretch I didn't drift off one way, and when I pressed the brakes I also did not drift either way. Stopped, felt near the rotors on both sides and they both felt about equal in temperature. Also popped the hood and checked the brake booster hose and it was secure as well. Checked other hoses and pcv while I was in there and everything seemed in order.
I'm still planning on jacking the front up and checking the brakes that way on my next day off.
I'll check the radiator cap when I go home in the morning. I'll also pop the maf out and clean it off when I get home.
Is there a way to easily check if an oxygen sensor is going bad? Any data the truck puts out to an obd2 scanner that I could look at and tell? I've read that you should change them between 60 and 90k miles and I'm at 97500 right now. I kinda don't wanna just throw oxygen sensors at it cause if I recall correctly they're a bit expensive
Again thanks for all the help from everyone

 

Yes

short/long term fuel trim, grams per sec, calculated load

A little 100$ hand-held one would do

 

So I plugged in my scanner I have at home and checked the oxygen sensor voltage and what I believe is the a/f ratio sensor voltage. Not sure what normal voltages are, but they all seemed about the same



O2 B1 S1 read about 3 volts +/- .4 volts



O2 B2 S1 was in the same range as the bank 1 sensor



I'm assuming the O2S21 (mA) reading is the a/f ratio sensor (I've read they're much more sensitive than regular o2 sensors) this one stayed around 0mA constantly with small fluctuations never over .01mA either way



Same with O2S11 stayed close to 0mA constantly.

I'm assuming these numbers are good since they're constant and both are reading the same for each sensor type

 

Did you ever figure it out? My truck just tanked on gas mileage as well.

 

I’ll jump on this another year later. Did the OP ever determine what was causing the decrease in mileage?

 

Clean the MAF and TB. Also the cruise control on these trucks is pretty dumb -- unless you are always on perfectly flat ground, you might get better MPGs without it.