Fuel Economy Dropped Drastically - Kia Niro Forum
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post #1 of 31 (permalink) Old 10-25-2018, 03:31 PM Thread Starter
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Fuel Economy Dropped Drastically

My average fuel economy 12k into ownership of my leftover 2017 Niro was 56 mpg. My driving habits and trips have not changed, but since immediately after my last oil change the mpg has dropped dramatically. I am now averaging 43 mpg and I have run through several tanks of fuel since this change.

Could the dealership have put the conventional oil in the engine (or perhaps the wrong grade of oil) to cause this? The temperature has dropped here in New England, but I purchased in March and it was by no means warm at that time.
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post #2 of 31 (permalink) Old 10-25-2018, 05:13 PM
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My mpg has dropped by over 10% in the last couple weeks due to a dramatic drop in temperature from the 80s to the 40s but yours is quite a bit higher. Cold plus the wrong oil still wouldn't add up. First thing I think about when I hear such a story is injectors. Anecdotally, sometimes that is the issue and no error codes result to pinpoint the problem.

So I'd check it out with your dealer, you will probably have to raise a fuss to get this resolved. I'd ask them about oil as well. I brought my own oil to the dealer for my first service. They claimed to have the right weight of oil (0-20) and that it was synthetic, but when I found out it was bulk instead of containers I could verify, I used the oil I had brought just in case. I guess I have trust issues! I could have asked to look in the service department at the (I'm guessing) drum they used, but I had this mental picture of a unlabeled nozzle from some back room with no way to trace it out.

My first tank in Feb this year was 42 mpg. Despite similar weather in the next few fills, I've never gotten below 49 mpg since. My 14,000 mile average is over 52 mpg if that helps. That is every drop measured, not the highly variable displayed mpg. If you have the 18" wheels, 43 mpg in cold weather is actually not bad.

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post #3 of 31 (permalink) Old 10-25-2018, 07:28 PM
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So, I have noted that my onboard MPH indicator was displaying results that were 3 MPG higher than actually calculated out by myself & Fuelie. Now that I have had my 7500 check which included 3 TSB fixes, it now reads almost spot on to my calculated results. My second fill up yesterday was within .1 of calculated.
Has anyone else noted this???
Wondering aloud!

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post #4 of 31 (permalink) Old 10-26-2018, 04:32 PM
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Might be random. My usual fill estimates 3 mpg above measured, but in 14,000 miles I've had exactly three fills that were below 1 mpg difference.

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post #5 of 31 (permalink) Old 10-27-2018, 08:52 AM
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Quote:
Originally Posted by KK6PD View Post
Now that I have had my 7500 check which included 3 TSB fixes, it now reads almost spot on to my calculated results. My second fill up yesterday was within .1 of calculated.

Does your work order list the TSB numbers that were applied? I just got mine and I have asked if there are any outstanding TSB's and was told no. But it's worth while knowing what others have had done to see if my dealer is just blowing smoke up my ass and don't want to actually do additional work until I bring it in for my first check.

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post #6 of 31 (permalink) Old 10-27-2018, 06:21 PM
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Quote:
Originally Posted by Roadkill401 View Post
Does your work order list the TSB numbers that were applied?

Why yes it does, I love how you can take pics of receipts in Fuelie, from the paperwork....
SA325 BRAKE FEEL IMPROVEMENT... and it does improve the feel, at least from my driving POV!
SA343 FRONT WIRING HARNESS....probably not responsible for fuel thing...
SA350 BATTERY MANAGEMENT.... who knows on this one...


all were done NO CHARGE, first oil was free, so out the door, $0.00 and ON TIME!


MY KIND OF SERVICE VISIT!!



still, 2 fill-ups both accurate on paper and on the MPG display, I'll take it!

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post #7 of 31 (permalink) Old 10-29-2018, 07:36 PM
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As soon as it started getting colder my mileage went from 60 MPG to 54 MPG.
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post #8 of 31 (permalink) Old 11-01-2018, 09:30 PM
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Same here, Boston area. I was doing 60-62 mpg in September (when in used AC is on auto and set at 74F). Since I started using the heat (on auto, set at 72F), I experienced the mpg drop to 54 mpg.
Frankly, this bodes well, since when I bought the car last July, I was expecting to do 50 mpg, not >60. So, I am fine even it drops at 48-50 mpg this winter.

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post #9 of 31 (permalink) Old 11-02-2018, 07:42 AM
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what is "fuelie"?
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post #10 of 31 (permalink) Old 11-19-2018, 05:39 PM
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Iím in California where there are winter or summer blends of gasoline along with E85 gas could this be why your having MPG lowered

https://newsroom.aaa.com/2013/06/wha...lend-gasoline/
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