Anyone else have issues with the Avg mpg display? - Hyundai Forums : Hyundai Forum
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#1 Old 09-27-2011, 09:47 PM
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Anyone else have issues with the Avg mpg display?

I know you guys are mostly from the US so your display says "Avg MPG", but since I'm in Canada and we use the metric system and cars are advertised as using a certain number of liters of gas per 100 km (yes the title was a trap ). So, my display says something like 7.2L/100km. Lower numbers are better, the car is advertised as doing City: 6.7/100km, Hwy: 4.9/100km, Combined: 5.9/100km.

I don't know why but it really helps me try to drive more smoothly when I can watch my average gas consumption (not the "instant" one, that's not exactly useful) on my car. But I noticed something a couple of days ago and I confirmed it this morning: when the car is off for a few hours, it seems that the avg L/100km goes higher!

I hold my average at around 7.5L/100km because I do mostly traffic and I'm not exactly an ECO driver. But 2 days ago when I turned on my car, all of a sudden that number was 22L/100km; a ridiculous number that could not possibly be true. I reset the counter and continued using the car.

Last night I'm fairly certain that number was around 7.5 as my "usual", but this morning it started off at 10.2! I didn't reset it this time as a test, and it gradually went down, all the way to 8.3 at the end of the day. So, definitely not my actual average consumption. I reset it again tonight just before turning off the car, and tomorrow I'll re-check if it changed.

Has anyone else noticed this issue? And if so, what do I do about it? Get my dealership involved and get them to fix the issue if they even can?

My car: Hyundai Accent 2012 GL, 5-door Hatchback, Apple Green (VE9), 6-speed Manual.
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#2 Old 09-27-2011, 11:07 PM
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Hi, i just got my Accent last thursday, still on my first tank, i reset the average consuption when i fill up the tank. Untill now, my average consuption never got bellow 10.8 L/100, im always on city driving, lots of start and stop traffic and right now the display shows 11.1 L/100, my Accent is the 1.4 model with a 4 speed auto ...

Is this average because its still a brand new engine or its something wrong with the computer calculations ??

Strange, i will see what happens after 2 or 3 fill ups.
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#3 Old 09-28-2011, 12:47 AM
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Originally Posted by john88a View Post
Hi, i just got my Accent last thursday, still on my first tank, i reset the average consuption when i fill up the tank. Untill now, my average consuption never got bellow 10.8 L/100, im always on city driving, lots of start and stop traffic and right now the display shows 11.1 L/100, my Accent is the 1.4 model with a 4 speed auto ...

Is this average because its still a brand new engine or its something wrong with the computer calculations ??

Strange, i will see what happens after 2 or 3 fill ups.
10-11 L/100kms seems wayyyy to high for a car that advertises ~5L/100kms...I get about 6-7 L/100kms on my MC (2010) Accent, but I do mostly highway driving...I know that when I do more city driving I get around 7.5 L/100kms...

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#4 Old 09-28-2011, 12:15 PM
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I realized after my test this morning is that the average consumption isn't going up while the car is off - it's jumping up while I'm starting to drive. The reset yesterday left it at 4.9L/100km, and that's exactly what it was at this morning. However, as soon as I shifted in, and as I was going up the street and turning to go towards work, the display quickly went up to 10, then 15, 20, and finally stopped climbing when it was at 24.3L/100km. It then gradually started going down until it was about 11L/100km when I got to work.

So, either the consumption is massively higher when the car is cold, or something is wrong with that display.

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Originally Posted by john88a View Post
Hi, i just got my Accent last thursday, still on my first tank, i reset the average consuption when i fill up the tank. Untill now, my average consuption never got bellow 10.8 L/100, im always on city driving, lots of start and stop traffic and right now the display shows 11.1 L/100, my Accent is the 1.4 model with a 4 speed auto ...

Is this average because its still a brand new engine or its something wrong with the computer calculations ??

Strange, i will see what happens after 2 or 3 fill ups.
Maybe your hint is that you have a 4-speed transmission, while I have a 6-speed. 2 gears make a major difference, especially at higher speeds. My previous car was an Accent 2007 5-speed manual, and it would go up to around 4000 RPM at 120km/h and start shaking. 4kRPM is very bad for gas consumption. I simply can't imagine how anyone could be using a 4 speed transmission...

My car: Hyundai Accent 2012 GL, 5-door Hatchback, Apple Green (VE9), 6-speed Manual.
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#5 Old 09-29-2011, 09:44 AM
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That sounds similar to a Scanguage display where the avg consumption resets after about 12 hours. After a re-set, the avg consumption appears higher during the early minutes after starting, then drops as the engine warms and the average speed increases. I wonder if the Accent applies the avg fuel consumption differently for mpg and km/l displays. I have not noticed the problem with my mpg display.

Being in Canada, maybe you are warming the car too long before starting out since you are so much further north? (This is said in jest since you are actually south of where I live in the United States. According to something I read, most of Canada's population is south of North Dakota, and the rest of the northern tier states by implication.)

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#6 Old 09-29-2011, 11:34 AM
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I don't actually let the car heat up that much, perhaps maybe a minute while my wife puts our daughter in the car seat and buckles up. And it did happen when I was alone coming back from work, meaning the car was on for about 10 seconds before I was on my way.

And right now, it's about 25 degrees celcius outside, so not Igloo and plaid shirt weather yet

If no one else has a similar issue (though I'd like to hear it from someone in Canada if there are any out there), then I'll ask the mechanic when I get my first oil change at the dealership.

My car: Hyundai Accent 2012 GL, 5-door Hatchback, Apple Green (VE9), 6-speed Manual.
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#7 Old 09-30-2011, 06:44 AM
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Originally Posted by eslachance View Post
I don't actually let the car heat up that much, perhaps maybe a minute while my wife puts our daughter in the car seat and buckles up. And it did happen when I was alone coming back from work, meaning the car was on for about 10 seconds before I was on my way.

And right now, it's about 25 degrees celcius outside, so not Igloo and plaid shirt weather yet

If no one else has a similar issue (though I'd like to hear it from someone in Canada if there are any out there), then I'll ask the mechanic when I get my first oil change at the dealership.
I have always used the real-time fuel economy setting but I'll try the average setting and see what I get...
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#8 Old 09-30-2011, 04:46 PM
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I set mine to real time.

OH, and on a side-note. When I went to fill up the AVG read 37.1, when I did my calculations I got 37.26. So it is pretty accurate.

My biggest pet peeve is the speedo being about 2mph off. GPS says 65, car says 67.
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#9 Old 09-30-2011, 07:11 PM
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Originally Posted by eslachance View Post
So, either the consumption is massively higher when the car is cold, or something is wrong with that display.
Just an FYI - fuel-consumption IS considerably higher when the engine is below ~140deg F. (60deg C.). It's a fuel-table issue, due to the vaporisation characteristic of Gasoline at low-temps. All IC engines have "cold-start enrichment" requirements, even Diesel.

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#10 Old 09-30-2011, 10:12 PM
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Originally Posted by The_AirHawk View Post
Just an FYI - fuel-consumption IS considerably higher when the engine is below ~140deg F. (60deg C.). It's a fuel-table issue, due to the vaporisation characteristic of Gasoline at low-temps. All IC engines have "cold-start enrichment" requirements, even Diesel.
Well then I guess that explains it. And it does explain how it could go all the way up to 24.3 after a reset of the meter, since it's the only numbers it has to base itself... I'm assuming this will be less and less of a problem as time goes by since I'll have more "hot" running than cold.

Thanks!

My car: Hyundai Accent 2012 GL, 5-door Hatchback, Apple Green (VE9), 6-speed Manual.
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