if your having poor gas mileage issues - Kia Forum
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#1 (permalink) Old 09-27-2010, 01:33 AM
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Default if your having poor gas mileage issues

if your having issues with poor gas mileage check your brakes. My rear pads were froze up causing the pads to wear out at about 30k, replaced pads cleaned/lubed everthing gas mileage improved. Just changed the front pads at 37k had 2 caliper slide bolts that were froze up, knocked them loose with a hammer cleaned and re-lubed them and gas mileage really jumped, car is not as jumpy from a start, and it shifts way smoother.
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#2 (permalink) Old 09-27-2010, 01:51 AM
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if your having issues with poor gas mileage check your brakes. My rear pads were froze up causing the pads to wear out at about 30k, replaced pads cleaned/lubed everthing gas mileage improved. Just changed the front pads at 37k had 2 caliper slide bolts that were froze up, knocked them loose with a hammer cleaned and re-lubed them and gas mileage really jumped, car is not as jumpy from a start, and it shifts way smoother.
I had the same problem. The dealer wanted $965 to fix the rear brakes. I took it to a local shop, $139! Mechanic found the right rear piston locked up and lubed it for free. New pads and resurfaced rotors too!
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#3 (permalink) Old 10-05-2010, 07:25 AM
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I brought my Optima in for service because I had some noise coming from the right rear wheel. Come to find out the caliper was sticking. So after a brake service on all 4 wheels, the noise is gone and mileage has gone from around 25 mpg to around 30.
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#4 (permalink) Old 10-11-2010, 07:07 AM
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Quote:
Originally Posted by junktier View Post
if your having issues with poor gas mileage check your brakes. My rear pads were froze up causing the pads to wear out at about 30k, replaced pads cleaned/lubed everthing gas mileage improved. Just changed the front pads at 37k had 2 caliper slide bolts that were froze up, knocked them loose with a hammer cleaned and re-lubed them and gas mileage really jumped, car is not as jumpy from a start, and it shifts way smoother.
A similar thing happened to my wife's Optima. In addition to this, I find that the oem and aftermarket brake pads for the Optima are a tight fit as well. I use a hand held grinder to remove a little of the material from the edges of the backing plate for the brakes and that helps with the seizing problem.

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#5 (permalink) Old 10-12-2010, 02:40 PM
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is this problem becoming common enough to have a recall issued about it? it hasn't happened to my 09 (yet) but if i notice any sluggishness, i'll have that be the first thing checked out.

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#6 (permalink) Old 02-02-2011, 07:55 PM
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Default Holy Crap Batman

I've literally just posted a reply to the "what kind of fuel economy are you getting" thread.

The 2010 Optima I just got is giving me crappy mileage and sometimes the mileage averages jump a lot. I've also noticed that this car doesn't coast like my wife Optima does.

Never would have thought to look at the brakes on such a new model, I was just going to chalk it up to a crappy 4 banger.

Scotty, how long to fix the brakes, we need warp speed in an hour.
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#7 (permalink) Old 02-04-2011, 12:37 PM
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I am curious about this issue now. I have noticed more & more a harsh break sound. If I push the break down all the way and release it completely, I get a harsh thud back. Now I now every vehicle does this, but it is just so harsh in my 2009 Optima. Makes me wonder if something is wrong.

I have been looking around about my poor fuel economy. 2009 Optima is listed as 21 city 31 highway. I am lucky to get 18 city. However on high mileage longs distance trips I seem to push 30 MPG. At 3,000 miles I went to Six Flags Great Adventure in NJ from Baltimore, MD and I was definitely please. Upon the return home I decided to fill up and noticed only using 3/8 of the tank. This comes out to just over 26MPG. Still under what the vehicles is suppose to get.

I use the ultimate from BP which is just Ammco Ultimate. The car runs the best on this. The engine is rough on regular fuels. I only use E10 gasoline as the manual says you can use E10 or regular and the engine is rough with regular.
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#8 (permalink) Old 02-04-2011, 07:23 PM
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Default I might need a dunce cap



I'm feeling pretty stupid today. My morning commutes are during the coldest part of the day, since I leave for work around 5 am and my afternoon's are just after 3 pm. In the northeast US, we've been getting banged up the last week with some lovely snow storms and wicked cold temps.

Today's morning commute had me traveling an -6 F.
After noon ride was 37 F.

Literally watched the fuel gauge drop from F to 3/4 on the morning ride.
Afternoon trip it dropped from 3/4 to almost 5/8(half way between 3/4 and 1/2).

Did the ambient air temp play a role? Who knows. Some online research suggests it did. I'll fill up after Monday's commute and see what is what.

I'm still going to do a brake inspection for good measure.
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#9 (permalink) Old 02-05-2011, 09:28 AM
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It made a big difference on my wife's car. 3-4 mpg.

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#10 (permalink) Old 02-05-2011, 09:50 AM
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That is why I always sand my caliper pins and grease them. You can do it yourself in less than an hour.

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