Poor Gas Mileage - Drive Accord Honda Forums
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post #1 of 30 Old 07-14-2009, 10:41 AM Thread Starter
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Poor Gas Mileage

Lately it seems my mileage has gone way down. I generally average around 300 miles before the fuel light comes on. The last two fill up's have resulted in the low fuel light coming on at 270 miles. I generally drive until the low light comes on and fill up with the fuel averaging anywhere from 11 to 12+ gallons of fuel. Most of my driving consists of city stop and go driving. It also seems that the "oomph" has gone from the engine and it it lags when accelerating. I have been driving with the air on all the time now and drive on the fast side. I have been been filling up with 87 octane gas at Circle K, I just refiled the other day at Mobil to see if mileage improves. Tomorrow I'm going to have the alignment and tires balance checked as I was driving the other day and felt a slight shimmy at 55mph. Air filter was clean, dumped a fuel cleaner in the tank a few fill up's ago. I've been debating about changing the fuel filter.

Any advice on what to look at would be appreciated.

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post #2 of 30 Old 07-14-2009, 10:49 AM
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Check your basic tune-up items:

Air filter - dirty? Replace it
MAF sensor - clean it with MAF sensor cleaner
Throttle body - dirty? Clean it with some tb cleaner
Tire air pressure?
Brakes - caliper sticking? Check the e-brake to see if in spec

Any CEL lights? If so, could be an o2 sensor.

Good luck.

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post #3 of 30 Old 07-14-2009, 10:54 AM Thread Starter
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Quote:
Originally Posted by golftango View Post
Check your basic tune-up items:

Air filter - dirty? Replace it
MAF sensor - clean it with MAF sensor cleaner
Throttle body - dirty? Clean it with some tb cleaner
Tire air pressure?
Brakes - caliper sticking? Check the e-brake to see if in spec

Any CEL lights? If so, could be an o2 sensor.

Good luck.
Can the MAF be cleaned with any electronic cleaner? When I have the tires checked tomorrow, I'll ask them to check the calipers. My brakes have been squeaking though.

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post #4 of 30 Old 07-14-2009, 11:00 AM
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Can the MAF be cleaned with any electronic cleaner?
No. Use use CRC MAF Cleaner which can be found at any auto part store. I have a write up with pics here:

Seafoam, clean MAF and new fluids

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post #5 of 30 Old 07-14-2009, 12:18 PM
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The fuel filter is just a metal screen in the tank, so you won't be changing that unless you really want to drop your tank. I don't know, it sounds like you answered you're own question when you said you've been running the AC all the time and you've been driving fast in the city. Those three factors would naturally mean lower mpgs. Generally mpgs go down due to the warmer weather in the summer time as well. Just some food for thought.

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post #6 of 30 Old 07-14-2009, 12:40 PM
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In my experience, mpg always goes up in the summer. A quick search online backs this up, with details as to why. On average, fuel economy is 10% lower in the winter -- this is combustion engines in general - not Accord specific.
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post #7 of 30 Old 07-14-2009, 12:41 PM Thread Starter
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The fuel filter is just a metal screen in the tank, so you won't be changing that unless you really want to drop your tank. I don't know, it sounds like you answered you're own question when you said you've been running the AC all the time and you've been driving fast in the city. Those three factors would naturally mean lower mpgs. Generally mpgs go down due to the warmer weather in the summer time as well. Just some food for thought.
Thanks on the info on the fuel filter, I was under the impression that it was located by the back of the drivers side engine bay. I do understand that there should be a drop off in mileage with the ac but in the 4 yrs I've had the car, I don't ever recall a drop like this.

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post #8 of 30 Old 07-14-2009, 01:14 PM
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Quote:
Originally Posted by Accordian169 View Post
The fuel filter is just a metal screen in the tank, so you won't be changing that unless you really want to drop your tank. I don't know, it sounds like you answered you're own question when you said you've been running the AC all the time and you've been driving fast in the city. Those three factors would naturally mean lower mpgs. Generally mpgs go down due to the warmer weather in the summer time as well. Just some food for thought.
Fuel economy is better in the summer/warm weather despite the addition of AC because cold engines require a richer fuel mixture and winter gas contains additives that allow it to be used in cold conditions but lower fuel economy.

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post #9 of 30 Old 07-14-2009, 02:06 PM
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I've got an 2005 LX also and I've been only getting like 280 per tank. When I first bought the car a year ago, I was getting close to 350 per tank. New air filter, tires are properly inflated, so who knows... I'll have to check out the maf sensor and throttle body.

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post #10 of 30 Old 07-14-2009, 03:31 PM Thread Starter
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Fuel economy is better in the summer/warm weather despite the addition of AC because cold engines require a richer fuel mixture and winter gas contains additives that allow it to be used in cold conditions but lower fuel economy.
I live in Florida and only use the ac during the summer months.

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post #11 of 30 Old 07-14-2009, 03:52 PM
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Quote:
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Fuel economy is better in the summer/warm weather despite the addition of AC because cold engines require a richer fuel mixture and winter gas contains additives that allow it to be used in cold conditions but lower fuel economy.
I guess it depends on where you live. Here in Arizona it goes down in the summer when it's 115 out. Our winters are usually in the 60s-70s so we get better mileage in the winter. I guess a cold climate might be different.

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post #12 of 30 Old 07-14-2009, 05:17 PM
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When I first got my car using the A/C killed my MPG after breaking it in I bearly notice. The A/C makes the car drive like @#$%. I seem like a NOOB when I try to move off with the A/C on.(Manual Trans)

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post #13 of 30 Old 07-14-2009, 10:06 PM
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When I first got my car using the A/C killed my MPG after breaking it in I bearly notice. The A/C makes the car drive like @#$%. I seem like a NOOB when I try to move off with the A/C on.(Manual Trans)
Not to mention the quicker RPM drops when the compressor is running.... which I like, IF it happened the the compressor is off too

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post #14 of 30 Old 07-14-2009, 11:26 PM
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Summertime and the AC lower your fuel mileage.
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post #15 of 30 Old 07-15-2009, 06:04 AM Thread Starter
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Had the balance, brakes and alignment checked this morning, all came up OK. I'm going to pick up some new spark plugs, MAF cleaner and a new cabin air filter. I'm thinking about taking the car and having a fuel system cleaning/treatment and hoping that this will restore some of the "oomph" to my acceleration.

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