HV mode MPG and engine RPM stats - 2018 Honda Clarity Forum
 1Likes
  • 1 Post By Clarity_newbie
 
Thread Tools
post #1 of 4 (permalink) Old 01-20-2019, 06:51 PM Thread Starter
Member
 
Join Date: Oct 2018
Posts: 43
HV mode MPG and engine RPM stats

I ran HV mode exclusively for 356 miles. Ran 4 days just as I would normally do...nothing out of the ordinary. Wind less than 15 mph entire testing period. No precip. As a matter of course, I run 89 octane pure gas (non-ethanol) in the Clarity. GVW = 4260 lbs. I conducted the test using normal HV mode. I never used ECON or sport mode.

- Temps 33 to 44 f. 1 day in the 40's. 3 days 33 to 38 degrees f
- 80% 2-lane and 4-lane roads with posted speeds limit 25 to 55 mph
- 20% Interstate posted speed limit 55 to 70 mph
- 52 EV mile range to start...11 mile range at finish. Never charged the Clarity during the 7 day period.
- I estimate 12 mile range gained through native regen...(ie) never used paddle shifters

- filled up with 6.80 gallons after 303* miles = 44.55 mpg in HV *after 53 miles deduction for EV*

I also placed a OBDll device at the beginning of the HV test. The OBDll device has a SD card installed and I programmed it to start a new log file every time I start the Clarity. 31 log files generated 81,800 data points. Ancillary info below

Speed breakdown
1 - 35 mph 39.4%
36 - 60 mph 42.3%
61 - 79 mph 18.3%

RPM breakdown
1000 - 40.47%
1001 to 2600 - 56.59%
2601 to 3600 - 2.39%
3601 to 4445 - 0.55%***

***This RPM occurred under the following conditions. EV range 12 miles. Travelling 55 mph up a 6% grade for 5 miles. These RPMs were recorded 3/4 of the way up and only for 42 seconds. I could hear the engine whine for sure but did not consider it egregious at all. Sounds to me like any other 4 cylinder when being asked to handle a arduous task.

Engine clutch mechanism engages as I expect on all roads where speed limit is ~45 or greater. When maintaining 45 mph speed or greater...it goes off when climbing noticeable grade and when descending a similar grade. Stays on majority of the time when maintaining speed. Very pleased with performance of the engine clutch.

Hope this helps.

Good luck.
Cruiter likes this.
Clarity_newbie is offline  
post #2 of 4 (permalink) Old 01-21-2019, 02:47 PM
Senior Member
 
Cruiter's Avatar
 
Join Date: Aug 2018
Posts: 132
Garage
Many thanks for most interesting post

I've not had many questions up to now LOL. But since you went to great ends to document...
Not many of us have easy year round access to 'pure' non-ethanol gas, could we talk you into another week of testing using regular '87' octane gas under the same conditions? Mostly I'd be interested in the MPG difference. I'm assuming you started your test with a full tank + charge and just drove your normal route for 303 miles before you had to add gas.
It would be interesting to know how much your range increased or decreased using the non-ethanol gas as the factory recommendation is regular 87 octane fuel.

Many thanks for that great documentation.
Quote:
Originally Posted by Clarity_newbie View Post
I ran HV mode exclusively for 356 miles. Ran 4 days just as I would normally do...nothing out of the ordinary. Wind less than 15 mph entire testing period. No precip. As a matter of course, I run 89 octane pure gas (non-ethanol) in the Clarity. GVW = 4260 lbs. I conducted the test using normal HV mode. I never used ECON or sport mode.

- Temps 33 to 44 f. 1 day in the 40's. 3 days 33 to 38 degrees f
- 80% 2-lane and 4-lane roads with posted speeds limit 25 to 55 mph
- 20% Interstate posted speed limit 55 to 70 mph
- 52 EV mile range to start...11 mile range at finish. Never charged the Clarity during the 7 day period.
- I estimate 12 mile range gained through native regen...(ie) never used paddle shifters

- filled up with 6.80 gallons after 303* miles = 44.55 mpg in HV *after 53 miles deduction for EV*

I also placed a OBDll device at the beginning of the HV test. The OBDll device has a SD card installed and I programmed it to start a new log file every time I start the Clarity. 31 log files generated 81,800 data points. Ancillary info below

Speed breakdown
1 - 35 mph 39.4%
36 - 60 mph 42.3%
61 - 79 mph 18.3%

RPM breakdown
1000 - 40.47%
1001 to 2600 - 56.59%
2601 to 3600 - 2.39%
3601 to 4445 - 0.55%***

***This RPM occurred under the following conditions. EV range 12 miles. Travelling 55 mph up a 6% grade for 5 miles. These RPMs were recorded 3/4 of the way up and only for 42 seconds. I could hear the engine whine for sure but did not consider it egregious at all. Sounds to me like any other 4 cylinder when being asked to handle a arduous task.

Engine clutch mechanism engages as I expect on all roads where speed limit is ~45 or greater. When maintaining 45 mph speed or greater...it goes off when climbing noticeable grade and when descending a similar grade. Stays on majority of the time when maintaining speed. Very pleased with performance of the engine clutch.

Hope this helps.

Good luck.

Jim Myers
2018 Clarity
White Touring
Windows tinted rear doors, rear quarter glass, & back window
Cruiter is offline  
post #3 of 4 (permalink) Old 01-23-2019, 08:50 PM
Junior Member
 
spireland's Avatar
 
Join Date: Oct 2018
Location: SF Bay Area
Posts: 10
Interesting stuff. Thank you for sharing.
spireland is offline  
post #4 of 4 (permalink) Old 01-24-2019, 01:04 AM Thread Starter
Member
 
Join Date: Oct 2018
Posts: 43
Cruiter

I plan on running the OBDll device in February for the whole month collecting data. This will not be a HV only mode. I will drive as normal using EV as normally try to do.

I do plan another HV mode only mpg test in May when temps much warmer to have comparative data.

On another Clarity forum there is a lot of discussion about RPMs/high reving. I decided to put the OBDll with sd card and run it just to get some baseline data for my Clarity and help others along the way. The beauty of the SD card is I program it...set it...and forget it till the test period is over. Allows for non bias driving over long period with boat load of data points.

I plan to post results on this site when ever I collect info I think is pertinent.

Hope this helps.
Clarity_newbie is offline  
Reply

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome