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CITY "Plant" Driving under 20 mph

Discussion in 'Gen 3 Prius Main Forum' started by msvenable, Aug 23, 2009.

  1. msvenable

    msvenable New Member

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    Hi; I work in a huge chemical plant with very hilly streets and have some unusual concerns. I drive over half my yearly mileage INSIDE this chemical plant (never leave windows down/cracked). My contract states that I must use my own car-not provided with company vehicle. I'm not getting great mileage at the top speed allowed (20 mph). Since the EV mode won't kick in until the engine has warmed and most of my customer related trips are with the engine from a cold start; many short trips, usually under 7 minutes drive time. What can I do to get better use of my 2010 Prius (mileage and maintenance wise)? I've only had the car one week.
     
  2. Airbalancer

    Airbalancer Active Member

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  3. JRitt

    JRitt Bio-Medical Equip. Tech

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    I would start by installing an engine block heater to keep it warm wh it not being driven (if there is an outlet availible). I would also look into a plug in conversion when it is availible for the Gen 3.
     
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  4. capek

    capek New Member

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    Have you read any of the threads on driving techniques? There is still a certain way you should drive, even for these short trips. I suggestion you peruse the fuel efficiency forum for threads about getting the most MPG out of your Prius. I was only getting around 37 MPG driving in what I thought was an efficient way. After reading some tips on that forum, I went for a midnight drive last night and averaged 64 MPG! Even accounting for the over-estimation that's still a huge increase and a lot of MPG. I've only had my Prius less than a weak, so I'm still learning the ropes.
     
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  5. TonyPSchaefer

    TonyPSchaefer Your Friendly Moderator
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    At such low speeds, I would be surprised if you get much - if any - "free" regen from braking or coasting. It would seem to me that the only way your battery is getting charged is while the engine is in warm-up mode. In this mode, it is consuming more-then-normal amounts of fuel to generate more heat.

    If that's a fair guess, then it's possible that your battery rarely gets above half-charged. This is important because the Prius achieves better mileage - on average - with higher states of charge. The lower battery charge would be impacted even more as you attempt to use EV more and more.

    If you are up to it, you can try multiple different driving approaches to see how they rank. It will take patience and might anger you from time to time when one isn't working as well as expected, but for the sake of your mileage and the community it would be an interesting series of experiments.

    I would start with a full tank and run it completely without once touching the EV button or intentionally trying to run on battery alone. In other words, see what the Prius will do on its own without intentional human intervention. That would set a benchmark. Then start tinkering with technique.

    I'm convinced that in the end, regardless of your Prius mileage, you will mostly likely still achieve better mileage than an average conventional vehicle.
     
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  6. bwilson4web

    bwilson4web BMW i3 and Model 3

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    How far do you commute to the plant each day? The reason I ask is this will be your daily 'warm-up'. Once there, you might consider putting in a radiator block, most of the inlet, until you are ready to leave. This will minimize heat loss so the engine has a chance to stay warm. At 20 mph, you are not going to over heat it.

    Pump up your tires to maximum sidewall pressure. At these speeds, rolling resistance is your chief drag. Higher pressure will give more low-speed relief than just about anything else.

    With the windows up, you're probably using the AC a lot. Somethings can't be helped. However, if you'll park in shade and use sun shields, you can reduce how much the AC has to run.

    Your driving profile is ideal for a plug-in conversion but I don't think any are available, yet.

    Bob Wilson
     
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  7. msvenable

    msvenable New Member

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    Wow, Thanks for the great advice, especially on driving techniques; and I believe all of you have hit the nail on the head with that one. I need to read up on driving, especially City driving. I have about a 12 minute drive either on a 4 lane or on a 2 lane hwy each morning before driving into the plant. Today, as soon as I drove in; I switched it to ev mode all the way to my office (about 7 minutes). Later; I had 2 such trips where the engine warmed up within one minute and allowed me to switch to ev mode. It's errie how silent it is. Now I need to read up on techniques. An engine heater would attract attention since I work for our Safety dept and am in charge of traffic design and safety. We have prohibited these for personal use (don't remember why exactly).
    On another note; today I drove across the plant to a different area. Twice when I exited the building; there was a crowd of people around my car. I am shocked that these (mainly industrial mechanics and electricians) guys just love this car. I thought they'd make fun of me for buying it.
    We have a big in-plant fleet of vehicles, including a recently purchased electric mini-van retrofitted in a russian vehicle; I'd like to see us purchase a few Prius' and see how they fit in. Thanks to all.
     
  8. msvenable

    msvenable New Member

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    ]
    Ha, ha; I'm over traffic safety there and we prohibit personal bikes inside the plant. We do have them in-plant though but are they ugly!! The industrial type.....
     
  9. bwilson4web

    bwilson4web BMW i3 and Model 3

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    You might want to have folks look at electric bikes:
    [​IMG]
    Put an industrial type, basket on the front ... something that can hold hand tools ... and you're good to go.

    This one uses a 48 V sealed, lead-acid battery. Require them to come with a 'plug-in' bike rack so when it is parked it is charging and you're good to go. It has a 1/2 hp motor and is speed limited to 25 mph. I'm 250 lbs and still get around without a problem. It ran $850.

    The pedals provide additional energy if the battery is low and actually draws more current from a too low battery. This one is Chinese made.

    I'm in Huntsville and would have no problem bringing mine up for an 'off site' evaluation. Something so you'd get an idea of what it can do. Send a PM.

    Bob Wilson
     
  10. msvenable

    msvenable New Member

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    ;)
    This actually came up again today via a question on motorcycles and bicycles inside the plant (personally owned). It appears our Texas plant has had no rules prohibiting them and they are now all over their plant. However, if a plant would write a complete set of rules and regulations up front; I am opening up to considering them in the near future. I don't believe we'd ever let in motorcycles but perhaps electric bicycles and/or personal bicycles. We have about 70 percent of our in plant traffic composed of tractor trailers and a huge amount of train traffic. You cannot drive 100 feet without crossing a track.
    I have been noticing that unless I put the prius in ev mode inside the plant; I'm getting not so great gas mileage. I believe the steep hills inside the plant and the congestion has a lot to do with it. On the bright side; I'm reembursed for my mileage....it helps and it doesn't matter if you're driving a vehicle that gets 15 or 50 mpg==the reembursement is the same...:cheer2:
     
  11. msvenable

    msvenable New Member

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    Update: I finally realized that some who answered this post were really correct. I no longer put the car on EV mode. When I first drive into the plant; I just let the car decide how to drive. It really puts the car into EV mode on it's own. Never getting over 20 mph doesn't really help the mileage on any car but I now leave the car in eco mode and let it decide how to best utilize the gas/battery. It has helped. The first full tank of gas I actually put into the car gave me a 46 mpg overall and I was pleased with that; given all the hills, moutains and the low speed inside our plant. I hope to learn better driving habits and allow the car to earn better mileage in the near future since I just went over the 1K mileage this weekend.
     
  12. msvenable

    msvenable New Member

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    To any of you who are interested; I have discovered that several of you were correct. Plant driving at an ave. of 20 mpg is a killer, even for a prius. It really kills the battery by the end of the day. I NO longer use the ev mode at all since that seems to take a greater toll but the car wants to use the battery only at such low speeds. My drive to work is around 12 minutes which charges the battery as well as the drive home. Also, anywhere I go in the City either at lunch or for the Company charges the battery but often when I start home in the evening; the battery is at 2 bars. I hope this won't kill off my battery much earlier than most. I've been driving my 4runner in at least one day a week (mostly because I forget how to drive it if I don't) and the reimbursements for gas mileage is now a hoot===I'm getting the same money that I get for the 15 mpg 4runner...finally near the end of my career, I've gotten something on the Company....ha ha ha.
     
  13. TonyPSchaefer

    TonyPSchaefer Your Friendly Moderator
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    Thanks for the follow-up. And thanks for not calling out by name those who were right; it lets the rest of us not feel so bad.

    And yeah, vehicle reimbursement when using a Prius is pretty sweet.