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Old 01-07-2013, 11:49 AM   #1 (permalink)
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2010 Tundra MPG Drop, need help

I have a 2010 DC, 4.6l, with 91,000 miles. and the past three tanks of gas I have noticed my mpg has dropped way off. I usually get 19-20 mpg with 90% of my driving highway.

As I am figuring now I'm getting about 13-14 mpg. I've done nothing different and do not know why I'm seeing this. On Saturday I changed my plugs and cleaned my MAF Sensor. since then I filled up and have drove 90 miles today and have used a 1/4 of a tank.

Up to now I have had no issues with my truck at all. Any help would be appreciated.
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Old 01-07-2013, 12:37 PM   #2 (permalink)
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hook it up to the techstream...see if ur getting a fault in sensor (o2) or intake lose
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Old 01-07-2013, 12:53 PM   #3 (permalink)
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If you are just basing it on miles driven versus the movement of the gas gauge, it is really not accurate. The only sure way is to fill, drive, and fill again. Then divide miles/gallons.
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Old 01-07-2013, 01:22 PM   #4 (permalink)
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Quote:
Originally Posted by bodio View Post
hook it up to the techstream...see if ur getting a fault in sensor (o2) or intake lose
Are these fairly common problems?

Reason I ask is because I too have a 2010, but with the 5.7. I've had it about a month now and I am getting sub about 9.5 mpg about 80/20 city/hwy? And the last 2 tanks I was very cautious of my foot.
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Old 01-07-2013, 01:35 PM   #5 (permalink)
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somethign has drastically happen to my truck too... 3 fills 100 miles to a half of a tank! cant figure it out
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Old 01-07-2013, 01:36 PM   #6 (permalink)
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Quote:
Originally Posted by rance23 View Post
I have a 2010 DC, 4.6l, with 91,000 miles. and the past three tanks of gas I have noticed my mpg has dropped way off. I usually get 19-20 mpg with 90% of my driving highway.

As I am figuring now I'm getting about 13-14 mpg. I've done nothing different and do not know why I'm seeing this. On Saturday I changed my plugs and cleaned my MAF Sensor. since then I filled up and have drove 90 miles today and have used a 1/4 of a tank.

Up to now I have had no issues with my truck at all. Any help would be appreciated.

WOW! You're doing some serious driving there bro. 91k miles on a 3 yr old truck. Not sure what the averages are for a 4.6l but my 5.7l is getting me in the 15 to 16 range.

Quote:
Originally Posted by KU_B View Post
Are these fairly common problems?

Reason I ask is because I too have a 2010, but with the 5.7. I've had it about a month now and I am getting sub about 9.5 mpg about 80/20 city/hwy? And the last 2 tanks I was very cautious of my foot.
Ouch!
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Old 01-07-2013, 02:07 PM   #7 (permalink)
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Quote:
Originally Posted by Slate CrewMax View Post
If you are just basing it on miles driven versus the movement of the gas gauge, it is really not accurate. The only sure way is to fill, drive, and fill again. Then divide miles/gallons.
not basing it on gas gauge moment, just wanted to give you guys a idea.

And yes I do a lot of driving. it is not uncommon for me to leave my house and when i get back that night i'll have put over 500mi on.

The more research I do I keep hearing winter gas will drop your mileage quite a bit. As I am from Texas that is something that I'm not familiar with. but i has be unusually cold down here for the past month. Could I be filling up with this?
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Old 01-07-2013, 02:16 PM   #8 (permalink)
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I wonder if winter blend is nation wide, given that we Americans are prone to driving all over creation?

I am in the northeast. My 2010 has the 5.7 liter. I have been driving 100 miles per day virtually every day since Jan 1, 2012. That is about 90% highway miles. In the Summer, my mileage got as high as 18 mpg. My last tank was consumed at just under 14 mpg, so the combination of longer warm up times in the morning and "winter blend" has brought my fuel efficiency down a fair amount.
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Old 01-07-2013, 04:42 PM   #9 (permalink)
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In Vegas we get our winter gas around October . There is always a sticker on the pump saying something like "this gas contains 10% ethanol" I'm not sure of the % or if it says ethanol but the gas is different and MPG's go down alittle. Your drop seems it is a combination of the winter gas and something wrong. I.E dirty air filter. etc,
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Old 01-07-2013, 04:47 PM   #10 (permalink)
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Begining last month I did an 1,800 mile trip doing 80mph and avg 17mpg for the whole trip. Didn't reset either. Have 150,945 miles on my 07 CM 5.7.
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Old 01-08-2013, 12:50 AM   #11 (permalink)
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My 2012 TRD SR5 6" lift 35 / 12.50's I'm getting 10.9 and this bites with only 25 gal tank. I'm coming from a 06 F-350 diesel that had a 38 gal tank on 7" lift 36/13.50's getting 18 highway 13.5 city . Truck looks great runs great but ouch fuel cost is not what I was thinking .
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Old 01-08-2013, 01:12 PM   #12 (permalink)
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idk what mpg i get...whats a good app i can use for sybian6 i always forget to reset the trip when filling up i got 35s with 7.5 inch in the front and 6 in the back gas isnt aways on my mind(i dont like paying for it) buts its because i have the SICKEST truck in the parking lot haha
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Old 01-08-2013, 01:16 PM   #13 (permalink)
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Quote:
Originally Posted by KU_B View Post
Are these fairly common problems?

Reason I ask is because I too have a 2010, but with the 5.7. I've had it about a month now and I am getting sub about 9.5 mpg about 80/20 city/hwy? And the last 2 tanks I was very cautious of my foot.
well u have 91k have u does service to the truck? things do get dirty and cause the vehicles to work harder then designed...hook up techstream...run some fuel cleaner a few times see where that gets u basically cost u about 25 dollars
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Old 01-08-2013, 02:44 PM   #14 (permalink)
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Quote:
Originally Posted by rance23 View Post
I have a 2010 DC, 4.6l, with 91,000 miles. and the past three tanks of gas I have noticed my mpg has dropped way off. I usually get 19-20 mpg with 90% of my driving highway.

As I am figuring now I'm getting about 13-14 mpg. I've done nothing different and do not know why I'm seeing this. On Saturday I changed my plugs and cleaned my MAF Sensor. since then I filled up and have drove 90 miles today and have used a 1/4 of a tank.

Up to now I have had no issues with my truck at all. Any help would be appreciated.
Just wondering, how did you clean your MAF Sensor? Wipe it with a rag, use any kind of cleaning solvent on it? Any chance you damaged the MAF or the wires attached to it during the cleaning process? Does the engine run & idle now as it did before you did the maintenance on it? (ie not running rough or bouncing idle, etc)

I do agree with others that winter blend gas will decrease MPG. Also agree with bodio about hooking your truck up to techstream and checking for any codes/faults.
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Old 01-08-2013, 07:43 PM   #15 (permalink)
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Just wondering, how did you clean your MAF Sensor? Wipe it with a rag, use any kind of cleaning solvent on it? Any chance you damaged the MAF or the wires attached to it during the cleaning process? Does the engine run & idle now as it did before you did the maintenance on it? (ie not running rough or bouncing idle,etc)
Cleaned it with CRC brand MAF sensor cleaner as per the directions.

The engine runs and idles fine before and after the maintenance.

Talked to the tundra tech today at the dealership. He said that he gets 2-3 calls a day about the mileage issues, and yes it is the winter fuel. Since it never gets that cold here it does cause an alarm when we do get a batch for unexpected cold temperatures

I'll just have let it run it course.
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