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Old 01-Dec-2009, 10:04 PM   #1
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2007 Honda Civic EX Poor Fuel Economy

Hi there,

Quick question!!!

I have a 2007 Honda Civic EX 5 speed. It has 57 000 kms on it and I seem to be getting pretty bad gas mileage. With a complete fill up I barely get 450 kms of city and hwy driving. I don't drive it hard at all. Oil is changed regularly and air filter has been replaced.

Any thoughts???

Thanks
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Old 01-Dec-2009, 10:27 PM   #2
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Wow, when I had my 06 EX, I was getting about 650 to a tank. Even now with my 07 Si, get about 550 to a tank.

Could be something simple like underinflated tires, bad alignment or even the colder weather. Could also be a clogged fuel filter or a bad o2 sensor.
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Old 01-Dec-2009, 10:34 PM   #3
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Bought car in May 08. Has been same fuel economy ever since. Tires are up to snuff. Think Honda would check it out under warranty???
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Old 01-Dec-2009, 10:48 PM   #4
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Wouldnt hurt to try, but Im sure they will tell you its your driving habits.
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Old 02-Dec-2009, 07:43 AM   #5
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Excess weight? Too many things in the trunk?
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Old 02-Dec-2009, 09:42 AM   #6
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Quote:
Originally Posted by dannn View Post
my post from original thread:

that stuff is true.
when you are filling a tank the air inside is getting displaced by the liquid fuel coming in. the epa is starting to get real strict on evaporative emissions (emissions that come from fuel evaporating into the atmosphere) so gas pumps have a system that will recover these vapors as they are being pushed out of the fill neck.

when the temp rises in the gas tank the pressure goes up and some of the gas turns into vapor state. back in the day the gas cap was designed to relieve the pressure (along with the fuel vapors to be vented into the atmosphere)

now it is required that cars have a vapor recovery system. this is what the charcol canister or sometimes called evap canister is for. it stores the vapor and releases them into the intake manifold at a time the system determines as proper to be burned as fuel.

also if fuel in liquid state reaches this charcol canister the charcol pellets will get saturated and will not be able to store vapors anymore and this will cause the car to fail emissions during an inspection. this is why they say over filling can damage your evap system. you cannot just replace the pellets, you will need to replace anything that the fuel has damaged in order for the system to work properly again.

if you take an old car like from the 60's and left it in a garage it will give off more emissions just staying there (not running) than a modern car idling in the same place.



im doing a write up on emissions system and will be posting it in the technical chat section.


overfilling the tank can cause bad fuel economy

cited from Don't top it off... what do you think? - 8th Generation Honda Civic Forum
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Old 02-Dec-2009, 10:06 AM   #7
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Wasn't aware of some of the things written there. Thanks for posting that.
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Old 02-Dec-2009, 10:50 AM   #8
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^ np
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Old 03-Dec-2009, 10:18 PM   #9
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I have the same problem

My old 06 LX gets about 650 kms, even if i drive it hard. Now my 09 LX-s is only around 500 kms. I don't know why but it's the same engine.. except my 09 is a 4dr.
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Old 03-Dec-2009, 10:43 PM   #10
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Originally Posted by snotz View Post
I have the same problem

My old 06 LX gets about 650 kms, even if i drive it hard. Now my 09 LX-s is only around 500 kms. I don't know why but it's the same engine.. except my 09 is a 4dr.

how many KM's on the car? I read that fuel economy goes up to its peak after two oil changes. and <10,000 miles.

Im on my first oil change and 11,000km on my 09 EX-L
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Old 11-Dec-2009, 12:05 AM   #11
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14,000 km on my 09 lx-
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Old 13-Feb-2011, 10:16 PM   #12
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I have a 2007 Civic ex coupe as well and i'm only getting 400-450 km to a tank aswell! no clue why, it's manual and i shift very low, 3000 rpms is the highest i go, usually shift at 2500.. puzzled why i am getting such low mileage..
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Old 16-Feb-2011, 10:05 PM   #13
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Its winter ppl! More fuel is required to achieve stoich in colder weather! Winter tires, longer warm up times all affect fuel economy. I went from 4.5 to 5.5L/100KM in the summer to 5.5 to 7.0L/100KM in the winter so its normal
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Old 17-Feb-2011, 12:41 AM   #14
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You guys think thats bad... ive been suffering with 400 - 450 during summer, 350 - 375 during winter.
00 Civic 323,000kms

Only thing I havent done (waiting till spring) is change my fuel filter, other wise a complete tune up has been done.
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Old 17-Feb-2011, 09:36 PM   #15
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I get 350 lol year round. did sparkplugs, air filter, cap and rotor. still stumped lol
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Old 17-Feb-2011, 09:36 PM   #16
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by the way thats on an integra, but they're supposed to get 400-500
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Old 28-Mar-2011, 05:35 PM   #17
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hey please let me know what you guys can come up with i get 330 on my 97 civic hatch (b20 vtec) year round ,,,
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Old 20-Jul-2013, 01:09 AM   #18
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I'm new to the forum, in fact i joined solely for the purpose of commenting to this specific post. I just bought a perfect condition 2007 EX Civic from a Honda dealership and it gets around 340-400 km/tank. everywhere i've looked has stated that i should be getting way more except for this forum. Is it specifically a 2007 ex civic problem, or have people with other years or trims of cars noticed the same thing? optimally i would like to find the cause and reverse it, because i bought the car for the gas mileage and so far its costing me $60 to fill for 350 km.
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Old 20-Jul-2013, 01:09 AM
 
 
 
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