[azgman9]

7000 miles with a overall average of 51.5 MPG. I run in "Normal" mode 100% of the time. I live in Tucson, AZ.

 

[aca2983]

I'm getting better than expected. Best tank 52.94, worst 49.37. Mixed mostly urban driving, fair weather. Every new car I've owned (except this one) had disappointing MPG until the first several thousand miles had past. Give it time but if it's way off tell the dealer. Driving style and terrain counts for a lot. Do the math don't trust the display.

 

[Jayhawk]

We bought our sport touring hybrid in late February. It started somewhere around 38 mpg but by the second tank we were in the high 40's. With the third tank we were running about 50-51 mpg. We took a 400 mile round trip highway visit to see our daughter and fam and the average dropped to about 46-47. Since then, and now with about 2K miles on the car, we're about 48+ mpg. Really like the car.

 

[Bluegrass]

We bought our sport touring hybrid in late February. It started somewhere around 38 mpg but by the second tank we were in the high 40's. With the third tank we were running about 50-51 mpg. We took a 400 mile round trip highway visit to see our daughter and fam and the average dropped to about 46-47. Since then, and now with about 2K miles on the car, we're about 48+ mpg. Really like the car.

I assume you're simply quoting what the trip computer is showing vs. calculating fuel economy yourself?

If so, you need to subtract 2.5 - 5.0 MPG from those numbers.

 

[Jayhawk]

You're right in that I was quoting mostly the computed mpg on the dash but the 2 tanks I calculated based on actual miles driven and gas pumped were only 1 mpg apart. We use eco mode and our previous car was also a hybrid. Dunno if that might help.

 

[Hatch808]

I just pumped my first tank for a 2025 Sport Touring Hatchback

Miles: 308
Gas: 6.4
MPG per Gas pumped: 48.2 (NOTE: Pump initially stopped at 6.1 but I topped off. Otherwise 50.6)
Trip Computer: 48.6

This is in Hawaii so cold temps were never an issue unless you consider 68 really cold lol. Drove a mix of about 60/40 city/highway. Speed on highway rarely gets above 65 as most speed limit is set at 55 here.

Since I saw someone ask- the AC is basically always set to Auto at 68, unless it's really hot and I crank it up for a little bit when I first get in.

I made a spreadsheet to track my lifetime MPG as I don't consider a single tank to be very accurate at all.

 

[or.eh]

I assume you're simply quoting what the trip computer is showing vs. calculating fuel economy yourself?

If so, you need to subtract 2.5 - 5.0 MPG from those numbers.

I did two long term tests of trip computer and it seems pretty acurate to me:

1st test, november 2023 to february 2024:

• distance: 6791 km (7 km to 6798 km on odometer) (~4220 miles)
• fuel: 426.96 l (~113 gal)
• manually calculated consumption: 6.28 l/100km (~37.45 mpg)
• consumption reported by trip computer: 6.3 l/100km (~37.3 mpg)

2nd test, februrary 2025 to may 2025

• distance: 7980 km (38245 km to 46225 km on odometer) (~4959miles)
• fuel: 389.32 l (~103 gal)
• manually calculated consumption: 4.87 l/100km (~48.29 mpg)
• consumption reported by trip computer: 4.9 l/100km (~48.0 mpg)

Overall, I've done 47003km (~29206 miles) and trip computer reports total fuel consumption of 5.0 l/100km (~47 mpg).

 

[Bluegrass]

I did two long term tests of trip computer and it seems pretty acurate to me:
1st test, november 2023 to february 2024:

You had the latest generation Civic Hybrid in November 2023?

 

[11406]

You had the latest generation Civic Hybrid in November 2023?

11th Gen Hybrid was available in non-N.A. markets in 2022.

 

[Bluegrass]

11th Gen Hybrid was available in non-N.A. markets in 2022.

Got it. That makes much more sense.
The vast majority of my fill-ups have been after driving 400+ miles, so I'm not calculating MPG on short drives like many do. And across ALL of those fill-ups, I've never had one that was comparable to the trip computer. They have all been ~1.5-4.0 MPG lower than the computer.

https://www.caranddriver.com/news/a...613/why-your-trip-computer-isnt-giving-accurate-mpg-readings-and-how-to-fix-it/

 

[or.eh]

I own european 2023 Civic eHev yes.

Have you tried testing over longer period of time with multiple fill ups to account for variance of when the gas nozzle decides the tank if full, temperature differences etc.?

 

[HaulinAuss]

We bought our sport touring hybrid in late February. It started somewhere around 38 mpg but by the second tank we were in the high 40's. With the third tank we were running about 50-51 mpg. We took a 400 mile round trip highway visit to see our daughter and fam and the average dropped to about 46-47. Since then, and now with about 2K miles on the car, we're about 48+ mpg. Really like the car.

MPG Very similar to our Sport Touring Hybrid that we also bought in February. However, i have found the actual mileage is about 2 MPG lower than the numbers on the display. I don't understand why it is not more accurate but im stiil very pleased with the MPG and the car in general.

I own european 2023 Civic eHev yes.

Have you tried testing over longer period of time with multiple fill ups to account for variance of when the gas nozzle decides the tank if full, temperature differences etc.?

I've checked out the actual MPG on multiple occasions. I have been consistent with the fill ups. I can say with a high degree of certainty that the actual mileage is approximately 2 MPG lower than the numbers on the display (avg difference may be 2.5 mpg). Many others have reached the same conclusion. This discrepancy is not unique with the Honda Civic Hybrid.

 

[Bluegrass]

I own european 2023 Civic eHev yes.

Have you tried testing over longer period of time with multiple fill ups to account for variance of when the gas nozzle decides the tank if full, temperature differences etc.?

I've driven my vehicle over 5000 miles since new.
The trip computer has been higher on every single fill-up.
The variance is ALWAYS in the same direction...lower MPG in reality than stated by the trip computer.

 

[or.eh]

Interesting, it might be US ones are just built different or I just got lucky with mine.

I prefer testing over multiple consecutive fill ups instead of single fill ups as there's just too many uncontrolled variables with single fill ups.

Do you by any chance have the totals of all fill ups in these 5000 miles since new? Do you know what is the total consumption discrepancy between manualy canculated and trip computer consumption over these 5000 miles? Would be interesting to see the actual number. Always cleaner to discuss based on hard numbers instead of mental aproximations.

 

[or.eh]

Many others have reached the same conclusion. This discrepancy is not unique with the Honda Civic Hybrid.

I guess the question is, who is lying, Honda or the gas stations 🙃. Is it intentional or a bug. Might be another dieselgate.

 

[HaulinAuss]

I guess the question is, who is lying, Honda or the gas stations 🙃. Is it intentional or a bug. Might be another dieselgate.
[/QUOTE
MPG issue not unique with Honda. Similar issue with our 24 Hyundai Tucson Hybrid but with an even greater discrepancy

 

[Hatch808]

I agree. Only did one fuel up but single tank averages are just too unreliable to give a decent MPG estimate.

On my one fill up I easily could have reported 308 miles on 6.1 gallons but I topped off and put in 6.4 instead. A MPG difference of about 50.5 to 48.1 a 2.4 MPG difference even using actual pumped gas.

I would say it's fair to say the trip computer reads higher than actual since I've seen that happened on multiple vehicles from different brands.

 

[Bluegrass]

I don't disagree that single tank calculations inherently have variability.
I manually calculate every tank, though I don't keep a historical record of that information along with what the trip computer claimed.

That said, EVERY single fill-up over the last 5,000 miles has yielded lower MPG than what is stated on the trip computer, by 1.5 - 3.5 MPG. As a result, it is statistically impossible for single tank variables to be responsible for the repeated discrepancy with the trip computer.

I've found the discrepancy grows as fuel economy increases.

• In the winter I was getting 41.5 MPG per the trip computer and 40 MPG hand calculated (a difference of 1.5 MPG).
• As temperatures moderated, the trip computer read mid-40s and manual calculations were consistently 2.0-2.5 MPG lower.
• In optimal conditions, the trip computer says 53.5 and manual calculations show 50.0 (a difference of 3.5 MPG).

 

[Jayhawk]

I don't disagree that single tank calculations inherently have variability.
I manually calculate every tank, though I don't keep a historical record of that information along with what the trip computer claimed.

That said, EVERY single fill-up over the last 5,000 miles has yielded lower MPG than what is stated on the trip computer, by 1.5 - 3.5 MPG. As a result, it is statistically impossible for single tank variables to be responsible for the repeated discrepancy with the trip computer.

I've found the discrepancy grows as fuel economy increases.

• In the winter I was getting 41.5 MPG per the trip computer and 40 MPG hand calculated (a difference of 1.5 MPG).
• As temperatures moderated, the trip computer read mid-40s and manual calculations were consistently 2.0-2.5 MPG lower.
• In optimal conditions, the trip computer says 53.5 and manual calculations show 50.0 (a difference of 3.5 MPG).

Good record keeping! Which driving mode are you normally in? Where are you on driving style?-- eg hypermile techniques or aggressive driving?

 

[Bluegrass]

Good record keeping! Which driving mode are you normally in? Where are you on driving style?-- eg hypermile techniques or aggressive driving?

99.5% of the time I'm in Normal driving mode. The other 0.5% is in Sport.
In terms of driving style, I'm 90% normal/relaxed, 10% aggressive, 0% hypermiler.

What helps my personal MPG is the type of roads I drive. It is mostly rural/suburban driving between 35-65 MPG with minimal traffic/stopping and considerable use of the regenerative paddles.

Cold weather has a significant negative impact on MPG. I'm consistently getting 5-10 MPG better now that winter is over.