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2009 Accord V6 terrible MPG #5264646 11/11/19 11:04 PM
Joined: Sep 2015
Posts: 223
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JEL01 Online Content OP
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Joined: Sep 2015
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Evening BITOG

My 09 Accord is drinking fuel like a large SUV, it has 29k miles and has been averaging about 17mpg in mixed driving lately. I just did the brakes, front and rear, and the calipers are not dragging anywhere, new air filter, tire pressure 33psi all around, ran a tank of techron through it but can’t get to the bottom of it. It runs great so I’m not sure what to try next to get the mileage back. I also tried unplugging the battery for 30 min to reset it.


What say the smartest forum on the internet?


Cars I maintain:
02 Mercedes CLK430
09 Honda Accord V6
13 Lexus RX350 AWD
02 Toyota Tundra 4x4
18 Lexus GX460
Re: 2009 Accord V6 terrible MPG [Re: JEL01] #5264654 11/11/19 11:29 PM
Joined: Nov 2018
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Skippy722 Offline
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Firing the “diagnostic cannon” check the MAP/MAF sensor and get a tool that reads live data to check the O2 sensors.


2016 Chrysler 300S v6
2018 Dodge Grand Caravan GT

Slight Mopar obsession
Re: 2009 Accord V6 terrible MPG [Re: JEL01] #5264656 11/11/19 11:30 PM
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Nick1994 Offline
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Depends on what you mean by mixed driving. Need some details, what's a daily commute look like, how many miles highway and how many city? Stop and go traffic? Any idling to warm up the car?


2015 Hyundai Sonata 2.4L 106k STP Synthetic HM 10w30 & OEM
2000 Toyota Camry 2.2L 235k Mobil Super HM 10w40 & Fram Ultra
1996 Jeep Cherokee 4.0L 149k Mobil 1 HM 10w40 & Fram Ultra
Re: 2009 Accord V6 terrible MPG [Re: JEL01] #5264658 11/11/19 11:35 PM
Joined: Sep 2015
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Sorry was distracted by the MNF game.

My commute is about 8 miles each way with 3 in town and 5 on the highway and some 20+ mile open road drives thrown in there regularly. I don’t warm it up at all either.

I’m thinking maybe cleaning the TB and MAF is in order, also nothing fancy in the crankcase, VWB 5w20 and Honda filter (oil and air) 700 miles ago

Last edited by JEL01; 11/11/19 11:37 PM.

Cars I maintain:
02 Mercedes CLK430
09 Honda Accord V6
13 Lexus RX350 AWD
02 Toyota Tundra 4x4
18 Lexus GX460
Re: 2009 Accord V6 terrible MPG [Re: JEL01] #5264662 11/11/19 11:37 PM
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ctechbob Offline
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Is this something new that just started?


2008 Acura TL Type S-155k
2003 Honda Accord V6-222k
Oil-Havoline HM 5W20
Filter-Partsmaster 61334
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Re: 2009 Accord V6 terrible MPG [Re: ctechbob] #5264663 11/11/19 11:38 PM
Joined: Sep 2015
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Originally Posted by ctechbob
Is this something new that just started?


Yeah over the last few months, not sure what’s going on, no CEL/codes


Cars I maintain:
02 Mercedes CLK430
09 Honda Accord V6
13 Lexus RX350 AWD
02 Toyota Tundra 4x4
18 Lexus GX460
Re: 2009 Accord V6 terrible MPG [Re: JEL01] #5264664 11/11/19 11:41 PM
Joined: Sep 2013
Posts: 159
AdmdeVilleneuve Offline
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Is the 29k miles noted supposed to be 129k or similar? Seems quite low for a 10 year old car.

Re: 2009 Accord V6 terrible MPG [Re: JEL01] #5264665 11/11/19 11:48 PM
Joined: Sep 2015
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JEL01 Online Content OP
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Nope you read that right, 29k. I got it a few months ago from a relative who rarely drove it, but it had been well cared for and perfectly fine until a couple months back. I have a VCM killer (SVCM) ready to install, but I want to get the baseline MPGs back before going that route


Cars I maintain:
02 Mercedes CLK430
09 Honda Accord V6
13 Lexus RX350 AWD
02 Toyota Tundra 4x4
18 Lexus GX460
Re: 2009 Accord V6 terrible MPG [Re: JEL01] #5264679 11/12/19 12:18 AM
Joined: Feb 2014
Posts: 439
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domer10 Online Content
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What octane gas? Gas up somewhere different? could be a funky batch of gas maybe?


2013Jeep Wrangler Sahara Unlimited
2001 Toyota 4Runner
20010 Harley Davidson Rocker
Re: 2009 Accord V6 terrible MPG [Re: JEL01] #5264683 11/12/19 12:38 AM
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The_Nuke Offline
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Such a short commute could be preventing closed loop operation of fuel/air mixing. Open loop isn’t going to be fuel efficient, isn’t supposed to be. If the car never reaches closed loop, or it is only there for a short while, less than expected MPGs would be the norm


2012 Charger Pursuit aka "The Bacon Hauler"
- 5.7L + NAG1 (A5) + 2.65 (215mm)
Re: 2009 Accord V6 terrible MPG [Re: JEL01] #5264686 11/12/19 12:38 AM
Joined: Jul 2008
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rubberchicken Offline
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By any chance do you drive with one foot on the gas, and the other on the brake ? If you have a IR thermostat , try reading the temps of the wheels and brakes- to see if you have a binding brake.

Re: 2009 Accord V6 terrible MPG [Re: JEL01] #5264695 11/12/19 01:29 AM
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pitzel Offline
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29k over 10 years tells me that most operation is very short trip. I know the mid 2000s Hondas (I-4 K24 and the V6's on the 7th gen) were incredibly aggressive at running very rich after startup to light the cats ASAP -- the 9th gen moved to DI and an exhaust manifold mounted cat to resolve such. Get a scan tool on it, make sure its coming up to temperature (190degF or higher) to rule out a stuck open thermostat, but unless its throwing codes, or has drivability issues, the root cause may very well be just very short trips. As others have suggested, put it on jackstands, put into neutral, and spin the wheels to detect dragging brakes.


Change your thinking...not your oil!
Turn your mind....not your rotors!
Re: 2009 Accord V6 terrible MPG [Re: JEL01] #5264712 11/12/19 03:32 AM
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Char Baby Offline
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In the Altima 2.5 in my signature, I just put on my winter tires/wheels and filled up the gas tank. I'm now getting 21 mpg, down from 29 mpg. AND I just freed up the driver side rear brake. I think it's more to do with the tires in my case and the temps just hit down into the 20*F over night.


"Retired"
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'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
Re: 2009 Accord V6 terrible MPG [Re: JEL01] #5264718 11/12/19 04:09 AM
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zeng Offline
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I'had similar issue of fuel consumption increase up to 20 % despite 44 psi tire pressure vs 31/35 at pillar .
Check and replace O2 sensor , back to normal .

Re: 2009 Accord V6 terrible MPG [Re: JEL01] #5264805 11/12/19 07:52 AM
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JohnnyJohnson Offline
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Sounds to me like your Honda is getting about average MPG

https://www.edmunds.com/honda/accord/2009/mpg/


2004 Corolla 137480
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