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I think the actual hp required for the Ioniq to go 60 mph is around 10 hp. That makes 1.6 hp added power needed pretty significant. For low intermittent use by UK drivers, it might not be noticeable over a full tank. But Florida drivers?
I must admit that I was taking a UK-centric view (where aircon compressors do not run constantly).
 

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First real trip in mmy new ioniq and getting this
31880
 

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2020 Hyundai Ioniq HEV Limited
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I bought my 2020 hybrid limited in July and am getting 38-42. My 12 year old Prius got 38-42 and was rated at 48/45 (and my driving style didn't suddenly change), so I expected much more from a new car rated at 55 combined. The dealer said to reset the fuel economy when I get gas, but I have always had it set to automatically do that. I did it manually a few times and no change. I guess I'll take it back again, but I doubt there's anything they can do. I guess Toyota just makes a much better hybrid.

I like everything else about the car except that the front sensors go haywire when I'm sitting still in traffic. No one's moving, and I am not close enough to anyone for the sensors to be going off.
 

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2017 Ioniq hybrid
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There are my 5 cents: Bought this car one month ago and this is my first long trip.
I traveled for 3600 miles on my Ioniq hybrid and got only about 35 MPG and sometimes 32 MPG. Tires are 17th, gas 87th, tire pressure 42PCI. Average speed was 66 mph. Most of the time I was on cruise mode. Temperature was about 40 to 77 F. No handbrake or check engine light. And my driving style is not aggressive at all. Sometimes when battery charge on flat road was only two positions down- transmission started to shift on lower gear back and forth (from my observation).
Is that normal MPG?
Just in case I replaced yesterday spark plugs on new iridium, although old ones were in good shape.
 

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Average speed is 66 mph? Does that mean you are cruising at 80 to 90 mph most of the time? I think we've found the issue!

But additionally: 17" tires have lower efficiency. Check your mpg by calculating it every time you fill up your tank. All cars get very different mpg at 40 degrees versus 77 degrees - approximately 20% different. Is this the daily difference? Why did you replace your spark plugs at 3,600 miles? is this a used car you just bought?
 

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2017 Ioniq hybrid
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Thanks for reply "yticolev". So you are trying to say that Ioniq is suitable only in cities and not on interstates/highways?
I bought it used and 17" tires are original from Hyundai production line. And "Yes" - my cruise control was set to 80 mph all the time.
 

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So you are trying to say that Ioniq is suitable only in cities and not on interstates/highways?
You posted a query about your poor mpg. Speed looks to be the primary issue and I mentioned a couple other possibilities that do not reflect on the car itself. If you compare your results to prior car, I'd bet they are far better. So your Ioniq would then be more suitable by that criteria. In fact, up to its limits, the Ioniq is ideal for fast driving because of its excellent aerodynamics.

Still, a 66 mph average is incredible. I once averaged about 70 mph over a 1,000 mile day back in the late 1970s including stops. But I was cruising at an indicated 95 mph on a motorcycle.
 

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2017 Ioniq hybrid
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Thanks again Yticolev. Basically that means that I can do nothing to improve my MPG 😟
 

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Sure you can. Drive slower! Getting 15" wheels is a significant improvement in mpg as well. Check your oil viscosity. You will get an automatic boost as weather warms up.

There is a possibility that your transmission hunting was related to a head wind. Imagine going 80 mph with a 20 mph headwind (intermittent to match your comments). That a huge power requirement. Anytime I get an mpg result that doesn't seem to correlate with driving conditions, I check my weather app. Wind is always the villain, or hero. Aways be suspicious when driving west as prevailing winds are usually from that direction, especially in the west and midwest.
 

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Thanks again Yticolev. Basically that means that I can do nothing to improve my MPG 😟
Yes you can. Slow Down!. The higher the speed the lower the MPG, and this applies to any vehicle. Simple Pyshics.
 

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2017 Ioniq hybrid
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Ok, I will try to use 0 - 16 oil viscosity instead of 0 - 20 and will adapt my driving speed a little bit too. Also will check all wheel bearings and brake release. Thanks for advices.
 

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In the past, going to a newly introduced lower viscosity oil has been fine. Not sure if the same applies to 0W-16. Car engines have to be specifically designed for it (which is also what they said in the past). I was tempted myself, but I think I'm going to pass unless Hyundai issues statement of acceptability.
 
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