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Hope someone can shed some light on this subject. I have a 2005 Tacoma 4D, V6. I bought the truck new and every tank of gas I have verified the gas mileage. This truck now has 80k miles, and beginning a couple of months ago, I noticed the gas mileage slowly getting worse. It seems to have stabilized now. I typically was getting 20.5 to 23 MPG, but now it has dropped to as low as 17 MPG. I service my truck every 5k miles and recently put in new plugs, oil and air filter, which has not helped at all. Tires are new too. I am a pretty good wrench, but could use some help on this one. Any suggestions on how to get my MPG back up in the 20's?

RIP
 

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2005 Taco 4x4 DC LB
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05 mileage drop

i just noticed a similar mileage drop of about 20% 2 months ago.
was getting 20-21mpg w. mixed city/hiway steady right from new, now its 16-17mpg.
only 23k miles on my 05. i've been running 87 octane , so i filled with 91 last time...made a very slight improvement, but not back to where it the mpg was. i changed tires, but the new goodyear fortera triple tread assurance are the exact same size as the oem dunlop r17's so that hasn't changed my odometer reading. havent changed plugs yet, but i have it regularly dealer serviced. mostly just me as a passenger, and no load in the back except my leer canopy.

i don't notice any performance change, my driving pattern is the same, my foot didnt get heavier, so something is going on. i'll be asking the dealer to address it next time in.
 
2005 Tacoma X-Runner
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You said the tires are new...what are they inflated to? Try running them high, like 38-40 psi.
 

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'05 Taco
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Does your gas have a different winter formula where you are? It does here and my milage is down also.
 

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^ He's from So Cal, I'm pretty sure they have the same gasoline formula all year round just like we do here in Vegas. To the OP, have your driving habits changed at all?
 

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I think the first step is to decided if it was an abrupt change, or an on going slower type of change in mileage.

In other words, did you notice it all f the sudden? Or did it take several months before it got to this point.

If it's a sudden thing, you have to see if there were any changes at all made to your vehicle around the same time. Did you put your new tires on? Did you change your air filter? Start using a different grade/different station fo gas? Did your check engine light come on?

If it was a slower process, maybe something is failing or needs to be cleaned. A catalytic convertor is collapsing? An o2 sensor? IAT sensor needs cleaning?

There are alot of possibilities so the best thing to do is to try to narrow the field down as much as possible then start from there.
 
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