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'06 Tacoma Gas Mileage Suffering

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Old 02-21-2011, 03:19 PM   #1
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'06 Tacoma Gas Mileage Suffering

Greetings -

First post here despite having owned my truck since new. Why? Because I've never had a problem with it!

The gas mileage is... down. I've always gotten right around 18 and 22 day in and day out. City is now down to just under 16. Highway is down to 20-21. The truck has 43K, a K&N filter, Cooper Discoverer tires. I burn 89 octane per the manufacturer's recommendation. Not sure what to think other than crappy winder blends of fuel but I'd like to hear ideas (I did recently service the filter). The truck has the oil changed every 4K and the tires rotated/checked every 5K. A cat. converter problem? I hope not...
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Old 02-21-2011, 04:40 PM   #3
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Quote:
Originally Posted by Brunes View Post
How about spark plugs?? When is the last time those were changed out. And how many miles do you have??
43K original plugs. Seems early but definitely NOT a bad idea. What plug would/can you recommend?
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Old 02-21-2011, 04:44 PM   #4
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Try cleaning your mass air flow sensor. especially with the drop in filter. that oil will soak through and coat the sensor and throw you milage off. just grab some electrical contact cleaner and then spray it down really good. It brought my milage back to normal after the slight drop.
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Old 02-21-2011, 05:08 PM   #5
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Excellent advice. I'll do the aforementioned and report back.
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Old 02-22-2011, 01:01 PM   #7
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OK. Plugs done. Mass Airflow Sensor done. Throttle body done. Great write ups on this site! Spent probably $36.00 on parts. Now we wait until I need more fuel.

Funny –I have maintained two BMWs and done extensive work on each, and generally stay ahead of the curve. I ASSumed the dealer and the other shop I use were looking out for me.
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Old 02-23-2011, 06:53 AM   #9
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And there I was, feeling good about doing 2 out of the 3 mentioned maintenance items. I'll hit the LSD fluid next payday, and dump in the injector cleaner ASAP.
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Old 02-23-2011, 07:54 AM   #10
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Something that rarely get's mentioned,,, but mpg problems can also be caused by the O2 sensors starting to go. Downside is you never know which one(s) it might be unless they fail completely and throw a code, and the price to replace 'em all is nasty.

But if you do everthing else and still no success, might want to consider this.
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Old 02-25-2011, 02:29 PM   #11
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Checked the mileage today @ fill-up. It's BACK UP. I only burned 1/2 tank since the tune up but I calculated it as 17.19 mpg (city driving only).
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