Computer Upgrade and MPG Change - Kia Niro Forum
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post #1 of 31 (permalink) Old 01-15-2019, 08:29 AM Thread Starter
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Computer Upgrade and MPG Change

I have read on some post about suspicion of MPG reduction after a Computer Upgrade. Not my intention to start a new topic on that, but I did not find that post.

So, thought I would start a post with that topic as Subject.

My Example on a car with 21,000 plus miles that had average (per Fuelly) of 51 MPG (maybe slightly less on a few HWY trips). I had a recall done (relay contact replaced or something) and they did a Computer Upgrade on 12-19-2018.

Then we did the following trip after a fill up on 01-03-2018 at 20,7000 miles that computed to 49MPG (some drop there from average of 51MPG).

THE TRIP:
01-04-19 at 21,112 miles for 422 miles traveled to Leland, NC area used 9.74 gallon at $2.199 at EXXON. That comes out 43.3MPG. A HWY trip at mostly 55 to 70 MPH, but that is say 4 MPG or more below any other HWY trips. NOTE: I had a recall done on 12-19-2018 and that included a computer update (???? - maybe cause of MPG drop).

01-13-19 at 21,345 miles for 223 miles travel in the Leland / Wilmington, NC area used 4.81 gallon at $1.959 at Circle K. That comes out 46.4MPG. I would say 50% city at 35 to 45 MPH and 50% HWY at 45 to 55MPH.
NOTE: A bit better than the 43.3MPG HWY trip, but still about 4 MPG below our average. NOTE: Again, I had the computer update on 12-19-2018.

01-14-19 at 21,770 miles for 425 miles traveled back to Sevierville, TN area used 9.176 miles at $1.929 at Weigel's. That comes out 46.3MPG. A HWY trip at mostly 55 to 70 MPG. That is better than the trip to Leland (43.3MPG going, 46.3 coming back, and about the same as MPG on local driving while there).
NOTE: I say again things seem to be 3 or 4 MPG less than my average of 51 MPG for 20,000 some miles and had the computer upgrade on 12-19-2018.

It is a EX Model with the option that includes the Sunroof purchased in Feb 2017.


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post #2 of 31 (permalink) Old 01-15-2019, 08:50 AM
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post #3 of 31 (permalink) Old 01-15-2019, 01:30 PM
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Is your ďreal timeĒ onboard computer in sync with your actual mpg numbers (assuming youíre still using Fuelly)? Or 2-3 mpg higher as many of us experience. Iíd like to see that fixed tho I donít think itís a Kia only problem.

2018 Niro Touring "Rich Espresso"


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post #4 of 31 (permalink) Old 01-15-2019, 03:04 PM
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Those figures are roughly in-line with what I'm getting in my PHEV. I seem to get 42-46 mpg typically (when I don't plug the car in, of course). I should have the most recent computer upgrade, as my dealer says everything is up-to-date as of 2 weeks ago.

2018 PHEV
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post #5 of 31 (permalink) Old 01-15-2019, 07:10 PM Thread Starter
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Originally Posted by tonepad View Post
Is your ďreal timeĒ onboard computer in sync with your actual mpg numbers (assuming youíre still using Fuelly)? Or 2-3 mpg higher as many of us experience. Iíd like to see that fixed tho I donít think itís a Kia only problem.
Computer MPG is higher ( couple MPG ) than hand calculated MPG (actual miles divided by gallon).


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post #6 of 31 (permalink) Old 01-15-2019, 07:15 PM Thread Starter
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Originally Posted by cockedandglocked View Post
Those figures are roughly in-line with what I'm getting in my PHEV. I seem to get 42-46 mpg typically (when I don't plug the car in, of course). I should have the most recent computer upgrade, as my dealer says everything is up-to-date as of 2 weeks ago.
I have no idea if PHEV computer upgrades are same as regular Hybrid. So, don't know that will have an affect on your PHEV.

It just bugged me that I got into the mid 40s MPG on this trip when my over all average for some 20,000 miles has been 51 MPG and about the worst I ever saw was 49 MPG.

I am talking actual MPG (miles driven divided by gallons) not the car computed mileage.


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post #7 of 31 (permalink) Old 01-15-2019, 11:50 PM
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You're kidding right? That's barely a flutter. Any small little difference could cause way more variation than what you've described. Things that all by themselves that would cause that tiny variation....
1. Tire pressure.
2. Outdoor temp.
3. Differences in speed...even subtle ones.
4. Differences in wind speed and direction. (I got 20% better mileage coming home today from work than going to work).
5. Small differences in the weight of the vehicle. Passengers, junk in the trunk, groceries, etc.
6. Different grades of gas.
7. Different gas stations/brands even with same grade.

Driving the exact same road every day to work and back, I see a 10 mpg window. i.e. average +/- 5 mpg. Which is totally normal.
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post #8 of 31 (permalink) Old 01-16-2019, 10:19 PM
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Agreed, mostly. Wind (and road speed), altitude delta, temperature are the biggest variables. Smaller ones are seasonal formulations of gas. Grades of gas? Doubtful.

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post #9 of 31 (permalink) Old 01-18-2019, 12:21 PM
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Quote:
Originally Posted by PAULRIDES View Post
I have read on some post about suspicion of MPG reduction after a Computer Upgrade. Not my intention to start a new topic on that, but I did not find that post.

So, thought I would start a post with that topic as Subject.

My Example on a car with 21,000 plus miles that had average (per Fuelly) of 51 MPG (maybe slightly less on a few HWY trips). I had a recall done (relay contact replaced or something) and they did a Computer Upgrade on 12-19-2018.

Then we did the following trip after a fill up on 01-03-2018 at 20,7000 miles that computed to 49MPG (some drop there from average of 51MPG).

THE TRIP:
01-04-19 at 21,112 miles for 422 miles traveled to Leland, NC area used 9.74 gallon at $2.199 at EXXON. That comes out 43.3MPG. A HWY trip at mostly 55 to 70 MPH, but that is say 4 MPG or more below any other HWY trips. NOTE: I had a recall done on 12-19-2018 and that included a computer update (???? - maybe cause of MPG drop).

01-13-19 at 21,345 miles for 223 miles travel in the Leland / Wilmington, NC area used 4.81 gallon at $1.959 at Circle K. That comes out 46.4MPG. I would say 50% city at 35 to 45 MPH and 50% HWY at 45 to 55MPH.
NOTE: A bit better than the 43.3MPG HWY trip, but still about 4 MPG below our average. NOTE: Again, I had the computer update on 12-19-2018.

01-14-19 at 21,770 miles for 425 miles traveled back to Sevierville, TN area used 9.176 miles at $1.929 at Weigel's. That comes out 46.3MPG. A HWY trip at mostly 55 to 70 MPG. That is better than the trip to Leland (43.3MPG going, 46.3 coming back, and about the same as MPG on local driving while there).
NOTE: I say again things seem to be 3 or 4 MPG less than my average of 51 MPG for 20,000 some miles and had the computer upgrade on 12-19-2018.

It is a EX Model with the option that includes the Sunroof purchased in Feb 2017.
I have the same model you do and I posted about the software recall, SA350. I purchased the car last May. My mileage was typically over 50 until this patch was installed in October. My mileage has dropped as low as 39 but is averaging 46. The service manager told me the software patch is for battery management and could yield a 10 MPG drop. I calculate my mileage by tracking fuel used versus miles traveled. Cold weather may be impacting mileage too but I didn't realize electric/hybrid cars were so sensitive to climate. Wasn't given that warning upon purchase and don't see anything about that in the manuals.
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post #10 of 31 (permalink) Old 01-18-2019, 12:47 PM
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39mpg seems low to me, assuming it wasn't just a short drive.


Even when I drive my car in a hurry to get somewhere (ie, "lead footed", and not trying to conserve gas) I still haven't ever dropped below 40mpg on any 25+ mile drive.


On shorter drives, sure, I've gotten as low as 10mpg on some drives, but that's also not unusual.


Keep in mind, also, that if you are "pre-warming" the car in the morning using remote-start or a scheduled climate control, the gas used for running the engine to warm the cabin while parked will be factored into the indicated MPG on your next drive. So if your car was pre-warmed, and then you go out to drive it within the next couple hours, your indicated MPG will be insanely low because the car used a bunch of fuel that morning to keep the engine idling while you ate breakfast.


When I start my morning commute in the winter, after the cabin has been pre-warmed, the first couple miles will show something ridiculously low like 11mpg. Then a mile later, it shows 20. A couple miles after that, it shows 30. Then a few more miles late, 40mpg, and so on.


So maybe some of you that are reporting drastic mpg losses in the winter are using the pre-warming function and not realizing the effect it has on your indicated mpg? Just a theory.

2018 PHEV

Last edited by cockedandglocked; 01-18-2019 at 12:54 PM.
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