Lousy mpg accuracy read out

[427435]

I've been careful not to reset my mpg readout during the last two tank fills. Doing the math indicates it's reading 7% high.

I have been using 87 octane which could be a part of it, however. I'm going to have to try 92 octane to see if that makes for better correlation.

I wish the mpg readout was like my other cars-----------they don't reset from tank to tank----------only when you actually reset it yourself.

 

[Potty_Pants]

Your not saying anything we dont know. ¦(

Could it be better yes.

One of the other threads it was identified the speedo is faster then real speed. This translated into more mpg. So even though it may be off when you make the correction it quite close....

Now my argument was comparing it to my crv and old car which is right !?!

Ppp

 

[GenesisCaptain]

Here's another thread with a lot of comments on it. If you are only 7% high, you are doing great. Mine is 10% - 15% high. That is totally useless.

http://www.genesisowners.com/hyundai-genesis-forum/showthread.php?t=1998&highlight=Accuracy

 

[IBJanky]

Drive more, worry less.

 

[Vermillion3]

Drive more, worry less.

Not to be rude but I tend to agree with the above. It would be safe to say that hardly none of us bought the Genesis for her fuel efficiency numbers; even more so if you have an R Spec.

Its like complaining that your German Chocolate Cake is mislabeled and instead of having 1500 calories it really has 1700 per slice....really if your are worried about calories why are you feeding your face with cake in the first place?

 

[SmoovC]

I tend to use the average mpg display as a gauge of my current driving style; not so much for actual mpg. I use odometer "A" for a more accurate indicator of how much gas is left. When it gets to 300 miles, I need to get gas soon. Odometer "B" tracks my miles driven per month.

 

[GenesisCaptain]

Not to be rude but I tend to agree with the above. It would be safe to say that hardly none of us bought the Genesis for her fuel efficiency numbers; even more so if you have an R Spec.

Its like complaining that your German Chocolate Cake is mislabeled and instead of having 1500 calories it really has 1700 per slice....really if your are worried about calories why are you feeding your face with cake in the first place?

I disagree. The thing that makes this more annoying than normal is that this is evidence of sloppy engineering or an attempt to deceive owners and drivers. The engine computers that record the data are very precise, so it is possible to know very accurately what the fuel efficiency is. Hyundai just chose not to present an accurate number. BMW does the same, but the error is much smaller, so it is less annoying. (And in a BMW, you can override the fudge factor to get the real number.) It would not be a big deal, except the lie is staring us in the face every time we cycle through our instrument cluster OBC.

 

[kimvellore]

mmmm... thats why they are paying you for every mile you drive.

http://www.foxnews.com/leisure/2013/02/28/hyundai-nearing-settlement-gas-mileage-cases/

I got my card for 8500 miles with ~$90.

Kim

 

[Mark_888]

Not to be rude but I tend to agree with the above. It would be safe to say that hardly none of us bought the Genesis for her fuel efficiency numbers; even more so if you have an R Spec.

I suspect that is true for the V8, but not necessarily for V6 owners. Maybe it was not the deciding factor, but the Genesis V6 did have very competitive fuel economy back in 2009 when I bought mine.

 

[427435]

Not to be rude but I tend to agree with the above. It would be safe to say that hardly none of us bought the Genesis for her fuel efficiency numbers; even more so if you have an R Spec.

Its like complaining that your German Chocolate Cake is mislabeled and instead of having 1500 calories it really has 1700 per slice....really if your are worried about calories why are you feeding your face with cake in the first place?

You are being rude!! I did not expect 30 mpg from the R-Spec (or even 25 mpg). I expected the info displayed to be accurate. Both my Explorer and 2003 Vette are within 1%. Heck, even the after-market Scan Gauge that I have on my motorhome is a lot closer than than Hyundai's readout.

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[GenesisCaptain]

Heck, even the after-market Scan Gauge that I have on my motorhome is a lot closer than than Hyundai's readout.

I bet if you plugged the Scan Gauge into the Genesis, it would be balls-on accurate. That would be an interesting test and comparison. The Scan Gauge is going to get exact miles driven and exact fuel volume dispensed through the injectors, so it should be able to be pretty exact in the MPG. If the Scan Gauge is accurate, then it is a pretty good indication that Hyundai is deliberately (either by omission or commission) feeding us crap information in the MPG display.

 

[Mark_888]

...it is a pretty good indication that Hyundai is deliberately (either by omission or commission) feeding us crap information in the MPG display.

There is a well-known saying in the auto sales business:

In terms of customer satisfaction, it is not whether the customer actually got a good deal on their car purchase, it only matters whether the customer thinks they got a good deal. Trying to make customers feel good about their purchase is all that matters.

These HMA guys are car people to the bone. You can't take the car salesman out them. Always trying to bamboozle customers.

 

[Vermillion3]

You are being rude!! I did not expect 30 mpg from the R-Spec (or even 25 mpg). I expected the info displayed to be accurate. Both my Explorer and 2003 Vette are within 1%. Heck, even the after-market Scan Gauge that I have on my motorhome is a lot closer than than Hyundai's readout.

Ok if I am going to get called for the foul then I might as well commit it. Granted the stock MPG computer is wrong on the Genesis. Wrong by as much as 15% wow BFD folks; last time I checked not a single one of us are operating in a environment where dead on accurate MPG is needed. Is anyone calling bingo fuel or declaring a fuel emergency if they don't get to a fuel station in the next 5 mins? No we are not. It is more for our own edification and gratification. Not single one of us have run out of fuel because that damn computer told me I had 10 more miles and it was wrong. The fact that it stops calculating range at 30 miles should tell you something about the units accuracy anyway. Nothing can beat your own calculations.

Sure other rides have better MPG monitors so be it..... it is a known quantity. Crunch your own numbers and move on if your so worried about fuel mileage buy a Prius. I apologize to the 3.8 owners who where looking for fuel mileage and luxury , as for the 4.6 and 5.0 drivers..... Really come on?! Enjoy the power and ride for what it is! And that is AWESOME!!!

 

[427435]

Ok if I am going to get called for the foul then I might as well commit it. Granted the stock MPG computer is wrong on the Genesis. Wrong by as much as 15% wow BFD folks; last time I checked not a single one of us are operating in a environment where dead on accurate MPG is needed. Is anyone calling bingo fuel or declaring a fuel emergency if they don't get to a fuel station in the next 5 mins? No we are not. It is more for our own edification and gratification. Not single one of us have run out of fuel because that damn computer told me I had 10 more miles and it was wrong. The fact that it stops calculating range at 30 miles should tell you something about the units accuracy anyway. Nothing can beat your own calculations.

Sure other rides have better MPG monitors so be it..... it is a known quantity. Crunch your own numbers and move on if your so worried about fuel mileage buy a Prius. I apologize to the 3.8 owners who where looking for fuel mileage and luxury , as for the 4.6 and 5.0 drivers..... Really come on?! Enjoy the power and ride for what it is! And that is AWESOME!!!

Makes one wonder if the Miles to Empty read-out can be trusted. I do use that.

 

[037]

When I bought my car the sales person gave me a receipt for filling it with 21.5 gallons of 93 (almost $100 bux at the time).

The only question I had for him was where he put the extra gas as the tank was supposed to be 19 gallons...

 

[Mark_888]

Ok if I am going to get called for the foul then I might as well commit it. Granted the stock MPG computer is wrong on the Genesis. Wrong by as much as 15% wow BFD folks; last time I checked not a single one of us are operating in a environment where dead on accurate MPG is needed. Is anyone calling bingo fuel or declaring a fuel emergency if they don't get to a fuel station in the next 5 mins? No we are not. It is more for our own edification and gratification. Not single one of us have run out of fuel because that damn computer told me I had 10 more miles and it was wrong. The fact that it stops calculating range at 30 miles should tell you something about the units accuracy anyway. Nothing can beat your own calculations.

Sure other rides have better MPG monitors so be it..... it is a known quantity. Crunch your own numbers and move on if your so worried about fuel mileage buy a Prius. I apologize to the 3.8 owners who where looking for fuel mileage and luxury , as for the 4.6 and 5.0 drivers..... Really come on?! Enjoy the power and ride for what it is! And that is AWESOME!!!

I think if there was reasonable explanation for the discrepancy, such as inaccurate hardware and/or software installed that calculates the MPG, that would be one thing. But there is a strong suspicion by many that the hardware and software installed in the Genesis to calculate the MPG is capable of a high degree of accuracy, and that Hyundai has tweaked it to deliberately cause an overly optimistic reading. Maybe I am wrong about that, but that seems to be the consensus in this thread.

 

[waveman]

I think if there was reasonable explanation for the discrepancy, such as inaccurate hardware and/or software installed that calculates the MPG, that would be one thing. But there is a strong suspicion by many that the hardware and software installed in the Genesis to calculate the MPG is capable of a high degree of accuracy, and that Hyundai has tweaked it to deliberately cause an overly optimistic reading. Maybe I am wrong about that, but that seems to be the consensus in this thread.

I suppose we'll never know if Hyundai has deliberately adjusted the MPG display to be on the high side, but there's no technical reason I know of why the reading shouldn't be accurate.

Makes one wonder if the Miles to Empty read-out can be trusted. I do use that.

Calculating miles to empty is more difficult, since there's no way for the software to determine future driving conditions. But I'd hope that the algorithm uses a recent average MPG for the calculation and errs on the conservative side. I only use the reading when the tank is very low, I'm running late, and don't want to take the time to fill up. Generally, though, I fill up when there's a quarter of a tank left, so it's rarely an issue.

 

[Vermillion3]

Makes one wonder if the Miles to Empty read-out can be trusted. I do use that.

You absolutely can trust the gauge located in the lower right of the instrument cluster. When it reads E it's time to refuel.

 

[EXBMWGUY]

I have always found the miles to empty to be conservative when I read the miles to empty and compare that to the number of gallons it allows me to put into the tank at fill-up. My experience with the average mpg is that it is more accurate on open highway driving and less so in city stop-and-go. I spend about .5 seconds dwelling on it or any assumptions about it because my expectation was low from the beginning.

 

[gameday22]

All the #'s, miles till empty etc. are just an estimate of how much further you can push your vehicle before needing fuel...furthermore it's really bad to let your tank get that empty to begin with considering the fuel pump relies on the gas to help keep it cool and you increase the odds of sucking sediment into the pump which will really foul up your MPG. Also keep in mind that the mpg shown till empty can vary rapidly depending on current driving conditions especially in heavy traffic, AC running, outside temp. I have run mine down a few times where it says < 50 miles but you should realize that your on borrowed time at that point....as with anything buyer be(aware).

I dind't buy the car because of MPG's, but because of it's performance and amenities for my $$. My last BMW cost 16k more, was in the shop more and was just as bad if not worse on mpg.