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post #11 of 28 (permalink) Old 10-26-2012, 07:40 AM
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Re: bad fuel mileage!

I also have a 4 cyl with the six speed in my '10. Had it for almost 3 years. I can never get anything higher than 26 based on the readout which imo sucks. With every other vehicle I have ever owned I always get very close to the stated mileage on the Marony label. This is the first vehicle where I get considerably less. My '12 Grand Cherokee with the 290 hp six gets about 23 as a comparison.

Since my warranty will expire next month I plan on taking it in to see if there are any flashes that could help.

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post #12 of 28 (permalink) Old 10-26-2012, 07:42 AM
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Re: bad fuel mileage!

19 mpg is quite low, however, since 99% of us are getting much better mileage, there must be something wrong, the car, or the driver. i have been doing a lot more city driving in the past 2 weeks and i have been pushing it a bit, much more aggressive than before. My mpg went from 29.5 to 27.6 according to DIC. Mind you, i got the 4 cyl.
To be honest with you, I have always beaten the sticker epa on all my cars, but one: the 1500Ram (what a bitch that was). Hell, I got 39.8mpg out of the boo, but i admit, that was no fun

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post #13 of 28 (permalink) Old 10-26-2012, 12:26 PM
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Re: bad fuel mileage!

It is probably important to ask what type of driving the driver is utilizing, what are the environmental conditions, and is he/she using the DIC avg? This also goes to everyone else.

The average combined is 26 by the EPA. It's 22 city and 33 hwy. 19, depending on where the vehicle is in it's life isn't far off the 22 mark. If it's a new engine and it's mostly city, you're going to see low figures, but it'll come up when the engine opens up. Likewise, getting anywhere near 30 is going to be accomplished on the highway cruising at 60+ mph ... not in the city or any sort of stop/go situation.

Edit: Missed the 50 miles on interstate. In that case, yes that's bad, but here's a question ... is the 19 you're seeing by resetting the DIC as you enter the interstate or is 19 what your average on the DIC is stating, which is taking everything else into account.

For the record, I drive 25 miles each way on interstate (50 miles+ a day) and my DIC avg is 24.5 ... but this is because of traffic and then the city on each end kills the near-30-mpg.

Also note, if your foot is constantly on and off the gas pedal ... that will kill your gas milage no matter where you are.

Last edited by snowleopard; 10-26-2012 at 12:29 PM.
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post #14 of 28 (permalink) Old 10-26-2012, 05:10 PM
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Re: bad fuel mileage!

My 2012 with the 2.4L just hit 4000 miles and mileage has went up a bit. The computer is saying average 34.5 mpg after I reset it for the week, which is the highest numbers yet. I always top off the tank til the fuel is at the top of the gas filler and then do the math after every fill up...my last tank doing the math was 33.5 mpg, mostly highway miles on mostly level road at 60mph. My lowest mpg has been 26 mpg in alot of stop and go traffic with hills combined with some highway....but the computer was saying the average was 28 mpg....so I really think the computer is just a guide and not the actual mpg the car is getting.

Last edited by Roadie; 10-26-2012 at 05:13 PM.
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post #15 of 28 (permalink) Old 10-27-2012, 06:23 AM
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Re: bad fuel mileage!

My '09 2.4 w/84k miles has gone up on the DIC from 25.3 to 27.1 over the 5k miles I've had / been driving it. 2 drivers BTW. No highway trips yet either.
Several Seafoam treatments, synth. oil and a K & N seem to have made the difference in my car.
This was a Co. car so I know it never had any fuel system maint. and probably was not on a top tier fuel diet or synth. oil either.
Just been using the DIC for reference as my wife uses the car on rainy days and may not always fill it up or record anything since it's the "beater" car in the household.
Car had a cheapo quickie lube air filter in it when I got it but it was clean so I left it in for a while, I think that was a big contributor to the what I think was a low mgg for a 4 banger. Her Mustang runs 22 mpg on it's DIC in the same use BTW so 25 mpg from a motor half the size seemed poor IMO.
More miles will be the proof positive......

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post #16 of 28 (permalink) Old 11-01-2012, 10:27 AM
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Re: bad fuel mileage!

@ecclampitt, I can understand your frustrations with the fuel economy. Could you send me a private message with the VIN of your vehicle as I would like to look into this?

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post #17 of 28 (permalink) Old 11-05-2012, 10:53 AM
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Re: bad fuel mileage!

I donít think the computer is just a guide. Itís measuring the exact volume of fuel going into the combustion chamber and the actual mileage the vehicle is moving to calculate the mpg.
Itís also important, like someone already mentioned here, to reset your DIC every time you fill up to get an accurate reading of mpg for that tank, otherwise your averaging the mpg over all the tanks of fuel burned.
I have the four with the 6 speed, and my best Highway, long distance drive, was 36.6 mpg. I drive round trip everyday 94 miles, mostly two lane highway with lots of traffic lights in some areas, and I get 30.5 to 31 mpg in the summer and 32 +mpg in the winter. It has a lot to do with driving habits, at least for me, when Iím careful I get the mpg I just mentioned, when I drive without thinking about it or fast acceleration or last second breaking it drops off 4 to 5 mpg.

Anyway, just my thoughts and experience.
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post #18 of 28 (permalink) Old 11-15-2012, 01:01 AM
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Re: bad fuel mileage!

Cold weather starts, and the idling your car does when warming up and how it drives for those first few minutes also hinder your mileage. I went from almost 400 Miles on a tank average to 225-250 miles on a tank, because of the -30 degree temps in Alaska. Although I assume you are not experiencing this extreme right now, it could be one of the issues.

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post #19 of 28 (permalink) Old 11-16-2012, 01:55 PM
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Re: bad fuel mileage!

Quote:
Originally Posted by kencar10 View Post
I donít think the computer is just a guide. Itís measuring the exact volume of fuel going into the combustion chamber and the actual mileage the vehicle is moving to calculate the mpg.
Itís also important, like someone already mentioned here, to reset your DIC every time you fill up to get an accurate reading of mpg for that tank, otherwise your averaging the mpg over all the tanks of fuel burned.
I have the four with the 6 speed, and my best Highway, long distance drive, was 36.6 mpg. I drive round trip everyday 94 miles, mostly two lane highway with lots of traffic lights in some areas, and I get 30.5 to 31 mpg in the summer and 32 +mpg in the winter. It has a lot to do with driving habits, at least for me, when Iím careful I get the mpg I just mentioned, when I drive without thinking about it or fast acceleration or last second breaking it drops off 4 to 5 mpg.

Anyway, just my thoughts and experience.
The DIC fuel economy readout has been discussed on these forums pretty frequently. While the measurement may be based on fuel injector readings, there is still a certain amount of error (which will decrease over the next decade or so) and as a result, pros like the people at Motor Trend and Car & Driver calculate their own fuel economy rather than rely on the digital display.

My car is always optimistic by .5 to 1 mpg. For some people, that's close enough, but I'm pretty particular about such things.


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post #20 of 28 (permalink) Old 11-17-2012, 11:49 AM
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Re: bad fuel mileage!

Quote:
Originally Posted by ecclampitt View Post
My 2011 Malibu has only gotten 19 mpg average. I am so frustrated with the car that I am beginning to hate it! I asked the dealer about it and they said they couldn't do anything about it! It doesn't matter whether I go local or highway, fast or slow! Does anybody know what I can do? Thanks.
I also have a Malibu 2011 2LT with the 4cyl. and get crummy gas mileage, although I burn E-85 which is supposed to give you less mileage. I've gotten as good as 24mpg on a mixture. I do mostly town driving which also probably screws up the mileage. My car is now in the shop for a leaking tranny and they screwed up when cleaning my fuel system and expanded the fuel tank, due to a faulty valve in the fuel system. Thank God I'm covered under my warranty, so I have a loaner, also a Malibu, 2012 LT. I don't know what I'm getting on that as yet. My car has been in the shop for over a week though. I was a previous Honda owner and I'm beginning to wonder if I made a good choice.
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