Burn gas in the AM or PM? - 2018 Honda Clarity Forum
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post #1 of 12 (permalink) Old 11-12-2019, 10:55 PM Thread Starter
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Burn gas in the AM or PM?

My commute is around 30 miles each way, and I don't charge at work, so if I leave home with a full charge I typically make it all the way to work and some percentage of the way home (huge seasonal variability) before I start burning gas. Since no matter what I'll be burning gas either in the morning on my way to work (if I select HV mode when I leave home) or in the evening on the way home, I'm wondering if anyone knows if one of those is better for the environment from an emissions perspective. The only thing I could think of is if I use HV mode when I leave home and burn a half gallon of gas on my way to work, then my car is about 4 lbs lighter for the drive home 😄
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post #2 of 12 (permalink) Old 11-13-2019, 12:21 AM
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ICE engines tend to run just slightly cleaner in warmer temperatures. I'd run it in the afternoon for emissions. Now for the real question - is your work higher or lower in elevation. Burn the gas in the downhill direction for the most efficient use of the ICE.

2018 Honda Clarity Touring PHEV - Forest Green w/Tan interior (wife's car)
2017 Volt LT - Heather Gray; black bow ties, Charcoal VoltShelf
2012 Cruze ECO MT (hail totaled 5/8/17 103,600 miles @42.5 MPG)
2010 Mit Lancer GT MT (traded for ECO @31K miles)
2002 Pont Montana AWD - title to son at college graduation
1990 Pont Transport (traded for Montana @240K miles)
1986 Fiero GT MT (traded for Transport - needed more seats)
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post #3 of 12 (permalink) Old 11-13-2019, 01:11 AM
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During cold weather you might also think about the fact that when ICE is running you get "free" heat from the engine, whereas in EV mode the resistance heater and/or seat warmer will be used. So for example assuming it is colder in the morning on the way to work than coming home at the end of the day, it might be better to run HV in the morning. On the other hand, many people who keep their car in an attached garage find that seat heating and maybe a little bit of resistance heat is all they need in the morning (along with some warm clothing), especially if they have a 240V charger and are able to precondition the cabin before departure. Whereas the return trip for them requires more heat since the car will have been sitting out in the cold all day and there is also no opportunity to precondition.

Not an exact science that's for sure, probably will take some experimentation to find out what works best for your particular commute.
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post #4 of 12 (permalink) Old 11-13-2019, 08:16 PM
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My suggestion: do you have some fairly long, say ten miles or so, sections of your route where you can usually enjoy pretty constant, moderate speeds, say 45-50 mph or so ? If so, use HV there, where your MPG will be higher.
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post #5 of 12 (permalink) Old 11-14-2019, 07:02 AM Thread Starter
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During cold weather you might also think about the fact that when ICE is running you get "free" heat from the engine, whereas in EV mode the resistance heater and/or seat warmer will be used
Good point! So do most phev cars have both an electric heater and a classical engine waste heat heating system? I wasnt sure if Clarity had this.
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post #6 of 12 (permalink) Old 11-14-2019, 09:22 AM
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Good point! So do most phev cars have both an electric heater and a classical engine waste heat heating system? I wasnt sure if Clarity had this.
All PHEV's use waste engine heat to heat the cabin when the engine is running. When the engine is not running both the Clarity and the Volt have a resistance heater that heats the coolant coming into the cabin. Prius Prime has a heat pump similar to what BEV cars use. Ioniq PHEV sadly has no electric heating, so in cold weather ICE has to cycle on and off to provide cabin heat, essentially Ioniq only works as a regular hybrid during winter if you want cabin heating.
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post #7 of 12 (permalink) Old 11-14-2019, 10:44 AM
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Quote:
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Good point! So do most phev cars have both an electric heater and a classical engine waste heat heating system? I wasnt sure if Clarity had this.
PHEV => Plug-in Hybrid Electric Vehicle. All Hybrids have ICE engines.

2018 Honda Clarity Touring PHEV - Forest Green w/Tan interior (wife's car)
2017 Volt LT - Heather Gray; black bow ties, Charcoal VoltShelf
2012 Cruze ECO MT (hail totaled 5/8/17 103,600 miles @42.5 MPG)
2010 Mit Lancer GT MT (traded for ECO @31K miles)
2002 Pont Montana AWD - title to son at college graduation
1990 Pont Transport (traded for Montana @240K miles)
1986 Fiero GT MT (traded for Transport - needed more seats)
1985 Fiero 2M4 MT (traded for Fiero GT @8K miles)
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post #8 of 12 (permalink) Old 11-14-2019, 02:25 PM
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Quote:
Originally Posted by Mink View Post
Good point! So do most phev cars have both an electric heater and a classical engine waste heat heating system? I wasnt sure if Clarity had this.
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Originally Posted by obermd View Post
PHEV => Plug-in Hybrid Electric Vehicle. All Hybrids have ICE engines.
True, but not all PHEV's can produce heat without running the ICE (no resistance heat or heat pump). All of the Hyundai/Kia PHEV offerings have no provision other than the ICE for cabin heat. This also means no way to precondition and get the car warm while plugged in.
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post #9 of 12 (permalink) Old 11-14-2019, 03:36 PM
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Since I wouldn't consider a Hyundai/Kia or Mitsubishi (all the same parent company) I didn't realize they don't provide electric heat.

2018 Honda Clarity Touring PHEV - Forest Green w/Tan interior (wife's car)
2017 Volt LT - Heather Gray; black bow ties, Charcoal VoltShelf
2012 Cruze ECO MT (hail totaled 5/8/17 103,600 miles @42.5 MPG)
2010 Mit Lancer GT MT (traded for ECO @31K miles)
2002 Pont Montana AWD - title to son at college graduation
1990 Pont Transport (traded for Montana @240K miles)
1986 Fiero GT MT (traded for Transport - needed more seats)
1985 Fiero 2M4 MT (traded for Fiero GT @8K miles)
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post #10 of 12 (permalink) Old 11-14-2019, 06:30 PM
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Since I wouldn't consider a Hyundai/Kia or Mitsubishi (all the same parent company)
Mitsubishi Motors (the automotive company) has no relationship with Hyundai/Kia. Nissan has a controlling interest in Mitsubishi and they are part of the Renault–Nissan–Mitsubishi Alliance where they cross share investments and technology. Mitsubishi did have a stake (10%?) in Hyundai a couple of decades ago, but that is no longer the case.

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