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Just from memory, I'm not sure the trip computer tells me an average speed. It does give me a total time and a total distance, though. But I forgot to look at that, so I can't even reverse-engineer the speed. :-(
LOL you made me check--I can tell you that the A/B trip computer shows miles driven, average speed, and time spent; the other trip computer that shows on the IPC display for a brief moment after you turn off the engine (it auto-resets) shows miles driven, fuel economy during that trip, and fuel range.
 

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Discussion Starter #42 (Edited)
I'm guess that the reason why it's not default-on is because Auto Hold works by applying the electronic parking brake and if you manually engage the EPB (e.g., when parking on a hill/slope) it wouldn't make sense for Auto Hold to be on since you intend for the EPB to be applied for more than a brief amount of time.

Speaking of Auto Hold--although it does come in handy while sitting on a hill or slope, it's more typically used in situations where you're stopped for an indeterminate but somewhat brief amount of time--e.g., waiting in a long line of cars while going through a drive-thru restaurant. For roll back concerns I believe our Optimas have Hill-start Assist Control (HAC) to take care of that--it works by applying the brakes automatically (while on a steep hill), releasing the brakes when the gas pedal is pressed or after about 2 seconds; if your car has it and you think it's not working correctly, then I suggest having a mechanic take a look at it. Note also that the owner's manual states that HAC does not replace the need to apply brakes (i.e.., press the brake pedal) while stopped on an incline.
Tonester, you are exactly right. I do have HAC. I experimented today. About 2 seconds of no brake, and it will roll backwards. I bet the couple times we saw that happen, we were just sitting there without holding the brake, probably undecided on whether or not it was a good time to pull out into traffic. It's a good lesson: if I'm not ready to go, then my foot should be on the brake. Thanks for setting me straight about HAC. It's better for me to learn a good driving habit than it is for me to use the Auto Hold feature unnecessarily.
 

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Discussion Starter #43 (Edited)
LOL you made me check--I can tell you that the A/B trip computer shows miles driven, average speed, and time spent; the other trip computer that shows on the IPC display for a brief moment after you turn off the engine (it auto-resets) shows miles driven, fuel economy during that trip, and fuel range.
Thanks, Tonester. I just went and looked at mine. mph isn't on there. It shows mpg instead. I wonder if that's a change for 2019.
 

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Discussion Starter #44
I was in the carpool line this morning dropping my daughter off at school, and I was in Smart mode, and I noticed that it was in "Smart - ECO" the whole time. I guess it switches into ECO mode when you're in stop-and-go traffic like that. Makes me think that Smart mode might be the way to go for the best gas mileage, since the 2019 EX doesn't have a user-selectable ECO mode.
 

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Thanks, Tonestar. I just went and looked at mine. mph isn't on there. It shows mpg instead. I wonder if that's a change for 2019.
If so, then IMHO that's a good thing--personally I'd prefer to see MPG readout on the (A/B) trip computer since at least you'd be able to see the ongoing MPG at any moment in time vs. cumulative MPG reading that displays immediately (but briefly) after you turn stop the engine and which only represents MPG between engine starts.
 

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Discussion Starter #46 (Edited)
6-4-19.jpg

Today I started my experimentation in earnest. Trying to be scientific about this, I plan to repeat the same trip over and over, varying the conditions as I go (and I realize some factors are out of my control). Namely, this is my trip home from work. Same path every day. Slightly uphill, about half interstate with a speed limit of 65 and half country roads with a speed limit around 50. Three traffic lights. Here are the details of today's drive:

Date: June 4, 2019
Total Distance: 14.2 miles (22.9 km)
Total Interstate: 8.3 miles (13.4 km)
Total Country Highways: 5.9 miles (9.5 km)
Start Elevation: 883 feet (269 meters)
Destination Elevation: 912 feet (278 meters)
Elevation Difference: 29 feet (9 meters) uphill
Brand of Gas: BP
Windows: Closed
Sunroof: Closed
Air Conditioning: On
Cruise Control: Off (Tried to maintain the speed limit)
Driving Mode: Smart
Driving Time: 19 minutes
Average Speed: 44.4 mph
Gas Mileage: 34.5 mpg
 

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NewAtKia--I reckon you already are aware that the traffic lights can be a factor--e.g., whether the lights are already red or green as you approach the intersection. Personally I have found that with my Optima, I can get slightly-better fuel economy when I engage the SCC compared to my trying to manipulate the throttle as fine (i.e., very fine pedal movements) as best I can. The only *negative* I've found when using SCC is that sometimes on slight downhill grades it tends to apply the brakes rather than let up on the throttle (i.e., coast) to bleed speed in order to maintain the set SCC speed when the vehicle speed starts to exceed the set speed; I would think that'd be a bit annoying, especially if there's no car in front of me and someone's following behind me--i.e., he might be thinking, "Why the heck is this idiot braking when he's not going really fast and there's nobody in front of him?"
 

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Discussion Starter #48
NewAtKia--I reckon you already are aware that the traffic lights can be a factor--e.g., whether the lights are already red or green as you approach the intersection. Personally I have found that with my Optima, I can get slightly-better fuel economy when I engage the SCC compared to my trying to manipulate the throttle as fine (i.e., very fine pedal movements) as best I can. The only *negative* I've found when using SCC is that sometimes on slight downhill grades it tends to apply the brakes rather than let up on the throttle (i.e., coast) to bleed speed in order to maintain the set SCC speed when the vehicle speed starts to exceed the set speed; I would think that'd be a bit annoying, especially if there's no car in front of me and someone's following behind me--i.e., he might be thinking, "Why the heck is this idiot braking when he's not going really fast and there's nobody in front of him?"
Thanks, Tonester. Yes, when I mentioned that some factors were out of my control, my number one thought was traffic lights. Not to mention slow vehicles and traffic. But you got me thinking. There is one thing I can do to lesson the impact of the lights. There is a light just after I leave my office parking lot. I often have to stop there for a while, though occasionally it's green as I get to it. I can eliminate that light from the equation by not resetting my trip computer until I'm at that light. I can do it from the steering wheel, so it's no hassle to hit the button as I'm going under the light. That way, I eliminate that variability from my experiments. I started that with today's drive home.

I think I'm also seeing better mileage when using cruise control. That's one thing to test.
 

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Discussion Starter #49
Date: June 5, 2019 (Same drive home from work, but resetting tripometer after the first traffic light)
Total Distance: 14.0 miles (22.5 km)
Total Interstate: 8.2 miles (13.2 km)
Total Country Highways: 5.8 miles (9.3 km)
Start Elevation: 833 feet (254 meters)
Destination Elevation: 912 feet (278 meters)
Elevation Difference: 79 feet (24 meters) uphill
Brand of Gas: BP
Windows: Closed
Sunroof: Closed
Air Conditioning: On
Cruise Control: On (Set at speed limit)
Driving Mode: Smart
Driving Time: 16 minutes
Average Speed: 51.9 mph
Gas Mileage: 35.6 mpg
 

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I think I'm also seeing better mileage when using cruise control. That's one thing to test.
Although in theory one should get better fuel economy when using cruise control vs. not using it, I find that in certain real-world scenarios I can achieve better economy with it off--sometimes when in CC the computer will decide a downshift is necessary in order to maintain the set speed, especially on inclines; I find that with CC off and with the proper throttle control I can maintain a specific speed on ascents without the PCM thinking that a downshift is in order.
 

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Discussion Starter #51
Although in theory one should get better fuel economy when using cruise control vs. not using it, I find that in certain real-world scenarios I can achieve better economy with it off--sometimes when in CC the computer will decide a downshift is necessary in order to maintain the set speed, especially on inclines; I find that with CC off and with the proper throttle control I can maintain a specific speed on ascents without the PCM thinking that a downshift is in order.
True, and there's also the thing about the ECO driving mode on the EX. In Cruise Control, it stays in Comfort mode, at least according to the display behind the steering wheel. With Cruise Control off, it will shift over to ECO mode during heavy traffic and slower driving. Those conditions don't happen in my test case, but in everyday life, it's a real thing.
 

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Discussion Starter #52
Date: June 6, 2019
Total Distance: 14.0 miles (22.5 km)
Total Interstate: 8.2 miles (13.2 km)
Total Country Highways: 5.8 miles (9.3 km)
Start Elevation: 833 feet (254 meters)
Destination Elevation: 912 feet (278 meters)
Elevation Difference: 79 feet (24 meters) uphill
Brand of Gas: BP
Windows: Closed
Sunroof: Closed
Air Conditioning: On
Cruise Control: On (Set at speed limit)
Driving Mode: Smart
Driving Time: 16 minutes
Average Speed: 51.9 mph
Gas Mileage: 36.9 mpg
 

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Although in theory one should get better fuel economy when using cruise control vs. not using it, I find that in certain real-world scenarios I can achieve better economy with it off--sometimes when in CC the computer will decide a downshift is necessary in order to maintain the set speed, especially on inclines; I find that with CC off and with the proper throttle control I can maintain a specific speed on ascents without the PCM thinking that a downshift is in order.

Same boat. And there also exists situations you achieve better MPG in normal mode vs eco mode. I've seen both.
 

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I get about 32-34 MPG with temps below 55*F with 5wt/20 60 MPH Highway and 34-36.5 MPG above 55*F with 5wt/30. I average about 34.5MPG at 60MPH in warm weather A/C on above 80*F. 90% is 4 lane highway.............
 

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Discussion Starter #55
Date: June 7, 2019
Total Distance: 14.0 miles (22.5 km)
Total Interstate: 8.2 miles (13.2 km)
Total Country Highways: 5.8 miles (9.3 km)
Start Elevation: 833 feet (254 meters)
Destination Elevation: 912 feet (278 meters)
Elevation Difference: 79 feet (24 meters) uphill
Brand of Gas: BP
Windows: Closed
Sunroof: Closed
Air Conditioning: Off
Cruise Control: On (Set at speed limit)
Driving Mode: Smart
Driving Time: 17 minutes
Average Speed: 49.5 mph
Gas Mileage: 35.2 mpg
 

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Discussion Starter #56
Date: June 10, 2019
Total Distance: 14.0 miles (22.5 km)
Total Interstate: 8.2 miles (13.2 km)
Total Country Highways: 5.8 miles (9.3 km)
Start Elevation: 833 feet (254 meters)
Destination Elevation: 912 feet (278 meters)
Elevation Difference: 79 feet (24 meters) uphill
Brand of Gas: BP
Windows: Closed
Sunroof: Closed
Air Conditioning: Off
Cruise Control: On (Set at speed limit)
Driving Mode: Smart
Driving Time: 17 minutes
Average Speed: 49.5 mph
Gas Mileage: 35.7 mpg
 

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I track all gas purchases and the mileage at the time. While my fill-ups aren't always from the same exact point, data correlation can still be made.

Feel free to see all the data here: https://1drv.ms/x/s!ArqXiPjhDlQzuUwoP0hzUyqKkt58?e=krgZtX (new OneDrive link (6/11/19))

Some stats (First Gas: 21 July 2012):
  • Total gallons to date: 3627
  • Total gas: $11,036
  • Avg Gal Price: $3.055
  • Avg Gal Fill: 13.001
Average mileage difference from previous fill:
2013221.3265
2014246.2963
2015293.6765
2016316.95
2017235.8431
2018231.1556
2019253.5556

If you love math, feel free to use my data to draw up some numbers!
 

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Discussion Starter #59 (Edited)
I track all gas purchases and the mileage at the time. While my fill-ups aren't always from the same exact point, data correlation can still be made.

Feel free to see all the data here: https://ufile.io/fkxvprez

Some stats (First Gas: 21 July 2012):



  • Total gallons to date: 3627
  • Total gas: $11,036
  • Avg Gal Price: $3.055
  • Avg Gal Fill: 13.001



Average mileage difference from previous fill:
2013
221.3265
2014246.2963
2015293.6765
2016316.95
2017235.8431
2018231.1556
2019253.5556

If you love math, feel free to use my data to draw up some numbers!


I like the idea of doing this in a spreadsheet. At least that would keep all this data offline, which might make some folks happy.
 

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Discussion Starter #60
I track all gas purchases and the mileage at the time. While my fill-ups aren't always from the same exact point, data correlation can still be made.

Feel free to see all the data here: https://ufile.io/fkxvprez

Some stats (First Gas: 21 July 2012):

  • Total gallons to date: 3627
  • Total gas: $11,036
  • Avg Gal Price: $3.055
  • Avg Gal Fill: 13.001

Average mileage difference from previous fill:
2013
221.3265
2014246.2963
2015293.6765
2016316.95
2017235.8431
2018231.1556
2019253.5556

If you love math, feel free to use my data to draw up some numbers!

Ok, lesson learned: be careful what you click on. The provided link took me to a site with porn ads, and it downloaded a porn file to my phone.
 
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