Got my Ioniq - Page 2 - Hyundai Forums : Hyundai Forum
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post #11 of 29 (permalink) Old 02-14-2017, 10:56 AM
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To clarify one item, the Ioniq will go into EV mode on the highway. The ICE (Internal Combustion Engine) charges the battery while it is running, so every few miles as the battery fills it should slip into EV (Electric Vehicle) mode for maybe a mile. That does look like great fuel economy on your trip, 74.7 UK MPG (62.2 US MPG). How is your fuel economy overall so far? And have you tried calculating how accurate the car's calculated fuel economy is?
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post #12 of 29 (permalink) Old 02-14-2017, 02:06 PM Thread Starter
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8000 miles I have averaged 65.1 UK mpg (54.25 mpg US) that is for a complete mix of driving, highway, town, rush hour, short and long runs


click on my fuelly signature below and you can see all my fill ups etc.


on general my on board trip computer is between 1%-2% optimistic, so pretty accurate (I have a excel sheet where I track trip v calculated)
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post #13 of 29 (permalink) Old 06-01-2017, 01:52 PM
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I'm a bit of a MPG nut myself and appreciate your info posted above. I would have liked to see the on board computer mpg readings posted side by side with the calculated mpg. I have done that for every fill-up in the past 20 years on all cars I've owned. My worst computer vs actual was from a 2014 Dodge Ram truck. It's computed mpg was about 5 mpg above actual. My first fill-up in my Hyundai Ioniq Hybrid (base model) was disappointing since the car computer was almost 5 mpg above my calculated (415 miles). Since I did not do the initial fill-up it could just be because it was not filled up all the way. I'm hoping for a better match in the numbers next time.

First Hyundai. Purchased Ioniq Hybrid 3 May 2017.
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post #14 of 29 (permalink) Old 06-05-2017, 09:48 AM
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My computer was way off my first tank as well. Like you I am not sure how full the car really was and the computer may have been reset at some point. My computer read 58.4 but my calculation was 55.4. Will report after my second tank of gas is complete.
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post #15 of 29 (permalink) Old 06-05-2017, 06:20 PM
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Originally Posted by he5makba View Post
My computer was way off my first tank as well. Like you I am not sure how full the car really was and the computer may have been reset at some point. My computer read 58.4 but my calculation was 55.4. Will report after my second tank of gas is complete.
One further note, you should also test your odometer. I know on the Sonata (and I believe other Hyundai models), the odometer generally underreports mileage by a few percentage points (maybe 2% or so).

Typically on highways there will be mile makers -- so one way to check is, when passing a mile maker, make a note of your odometer and then drive for maybe 10 miles, and note the odometer after hitting the mile marker after 10 miles. In my case, my odometer read only about 9.8 miles after driving 10 miles.

Another option, that others have done, is to use a GPS that will track the miles you've driven.
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post #16 of 29 (permalink) Old 06-09-2017, 11:25 AM
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Actually reporting less mileage than actual is to your benefit concerning 100,000 mile warranty and things like that. Most people only complain when the mileage displayed is higher than actual. I remember a law suit against Honda (I think) where a person was denied warranty service because the car was like 20 miles over the limit for coverage. They proved the mileage gauge was actually reading higher and won the case.

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post #17 of 29 (permalink) Old 06-09-2017, 02:00 PM
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Originally Posted by Loafer View Post
Actually reporting less mileage than actual is to your benefit concerning 100,000 mile warranty and things like that. Most people only complain when the mileage displayed is higher than actual. I remember a law suit against Honda (I think) where a person was denied warranty service because the car was like 20 miles over the limit for coverage. They proved the mileage gauge was actually reading higher and won the case.
Yes, it is definitely an advantage to have the odometer under report, just that you need to take it into account when calculating fuel economy. What people have found with the Sonata Hybrid is that the fuel economy calculated by the car is fairly accurate, once you adjust for the odometer reading being low.
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post #18 of 29 (permalink) Old 06-11-2017, 08:33 AM
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Well if my Ioniq reports the mpg within 2% I will be happy. My first comparison to actual was closer to 7%. I'm over 600 miles on the new tank of gas now so soon I will get another reading which should be pretty close since I filled the tank very full and will do exactly the same thing again. I admit I have been babying the car to get the best mpg possible on this tank. Next time I will set the display to not show mpg and drive without concern for mpg to see the difference.

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post #19 of 29 (permalink) Old 06-12-2017, 12:58 AM
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We have only had our Ioniq for about a month and it had 30 miles on it when we got it - full tank when delivered. Had the first fill-up at 580 miles on the ODO took 10.2 gallons to fill it and the mileage meter on the display said 54.2 mpg so 580 - 30 = 550 miles driven on tankful and 10.2 gallons = 53.9 mpg so I would say the indicated MPG is pretty darn close.
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post #20 of 29 (permalink) Old 06-12-2017, 10:04 AM
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I don't know which model of the Ioniq Hybrid you have so I don't know if the 54 mpg is what is expected. Mine is the base model and rated at 58 mpg so I would be happy in your case that the mpg was accurate but disappointed in 54 mpg instead of the advertised 58 mpg.
My car right now has 638 miles on this tank of gas and says I still am good for 68 more miles. The mpg is showing 69.9 mpg and I don't believe it. In the next day or two when it gets down to empty I will find out the truth. I still have 2 little blocks showing on my gas gauge but it's been that way for a while so I'm expecting it to drop to 1 block very soon. I don't know how much gas will still be in the tank when I get down to empty (on the gauge or get an "empty" message) but I want to find that out too so I will wait until it happens. Most cars give a "Empty" message when there is still about 1.5 to 2 gallons still in the tank.

First Hyundai. Purchased Ioniq Hybrid 3 May 2017.
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