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In the midst of an exceptional tank

Discussion in 'Gen 2 Prius Fuel Economy' started by efusco, May 6, 2007.

  1. priussoris

    priussoris New Member

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    Good job on the high MPG next push 700mpg
     
  2. FireEngineer

    FireEngineer Active Member

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    <div class='quotetop'>QUOTE(efusco @ May 15 2007, 07:03 AM) [snapback]442314[/snapback]</div>
    As has been mentioned at CMPG...Hybridfest...travel to Hybridfest.

    Wayne-Who will be taking the highway since two teens and the wife don't want to see the "back roads".
     
  3. efusco

    efusco Moderator Emeritus
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    <div class='quotetop'>QUOTE(FireEngineer @ May 15 2007, 09:20 AM) [snapback]442388[/snapback]</div>
    Yea, that's just not going to happen. It's too far a trip as it is Even going the interstate speed limit if I drive all the way to Madison from home I'm looking at a 10-11 hour day assuming minimal construction slow downs. If I were to back-road/hypermile it would be a 2 day journey for sure.
     
  4. Darken

    Darken Active Member

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    Congrats on the exceptional tank Evan! I've been following your progress on this thread and was glad to see you exceeded 70 MPG.

    I'm not going to bring up a long debate over the accuracy of the MFD...I realise how it calculates the mileage....but I'm still confused by its MPG calculation. I'm currently sitting at 59.7 on just 432 miles with 3 pips left. Then I look at Green Hokie screen shot of (60.4 / 571 miles) and wonder how can he be achieving 140 miles more for the tank with one less pip then I? Our average MPG is not that far off and I expect to be able to bring my number back over 60 MPG before having to fuel up...so why the large total mileage varience for the tank? It just seems odd to me.... :huh:
     
  5. morpheusx

    morpheusx Professor Chaos

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    <div class='quotetop'>QUOTE(Darken @ May 15 2007, 12:03 PM) [snapback]442453[/snapback]</div>
    I was just able to pull off a 603 mile tank at 55.6 MPG but my last pip was flashing the last 20 - 25 miles. I squeezed as much gas as possible back into the tank and could only get 10.9 gallons back in it. I am really into topping off (I can usually squeeze in an additional gallon after initial shutoff) I hate getting gas so the less I have to go the better.
     
  6. efusco

    efusco Moderator Emeritus
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    <div class='quotetop'>QUOTE(Darken @ May 15 2007, 11:03 AM) [snapback]442453[/snapback]</div>
    The problem isn't the MFD's calculation...it's very accurate. The problem is the variences in the tank..how much you fill, temperture, and the terrain you drive on is a big issue as well. For instance, with this last tank, I had the last pip start blinking while driving...CAN-View showed 12% tank volume. After parking and sitting level during my shift at work it was up to 15%, down to 12% again when I got home and back up to 15% again the next morning....it held that for about 50 miles when it finally dropped to 10% and I got gun shy and filled up.
     
  7. Darken

    Darken Active Member

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    <div class='quotetop'>QUOTE(efusco @ May 15 2007, 01:09 PM) [snapback]442506[/snapback]</div>
    Thanks Evan, that makes a little more sense to me. I didn't think you could go that far on the last flasing pip, don't think I would try it either without something like CAN-view to guide me (or a spare gallon of gas in the 'trunk'). Generally I end up putting approx 9.5 gallons when fueling after the last pip starts flashing (that is with some 'top off' at the end). Temperatures been pretty consistant here for this tank (Around 70 during the day) but then again I don't have a block heater installed yet so my starts are 'cold'. I also travel over quite a bit of hilly terrain during my commute as well, so perhaps that plays a part.

    All things to think about, its a learning process to be sure..
     
  8. tbstout2

    tbstout2 Member

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    Evan,

    What tires are you running and what are the inflations?

    Thanks!
     
  9. efusco

    efusco Moderator Emeritus
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    <div class='quotetop'>QUOTE(tbstout2 @ May 15 2007, 12:44 PM) [snapback]442541[/snapback]</div>
    Michelin HydroEdge at 44f/42r (but I haven't checked them for almost 2 months...don't tell anyone!)
     
  10. DaveinOlyWA

    DaveinOlyWA 3rd Time was Solariffic!!

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    congrats on your tank Evan!! i did rely on CANVIEW's gas gauge when i did my 650+ mile tank and waited until i was at 2% for nearly 10 miles (it did bounce to zero% a few times) but i felt comfortable with CANVIEW's reading. i also had tracked it from the "beep" and decided a rate of 6 miles per percent was a guideline for not running out of gas.
     
  11. jkash

    jkash Member

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    Evan,

    How long is your commute and how many times do you have to stop? I counted my stops today in my 12 mile trip to school and then back home. I stopped 21 times on the way to school and 22 times on the way home. I don't think I can approach 70 mpg stopping that many times. I'm pretty happy being able to keep my mpg at about 53.
     
  12. jkash

    jkash Member

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    Evan,

    How long is your commute and how many times do you have to stop? I counted my stops today in my 12 mile trip to school and then back home. I stopped 21 times on the way to school and 22 times on the way home. I don't think I can approach 70 mpg stopping that many times. I'm pretty happy being able to keep my mpg at about 53.
     
  13. efusco

    efusco Moderator Emeritus
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    <div class='quotetop'>QUOTE(jkash @ May 15 2007, 08:10 PM) [snapback]442900[/snapback]</div>
    My "main"/work commute is right at 15 miles. I take a back route that requires b/w 8 and 15 stops depending upon how many lights I can time along the way. I have some pretty long stretches that help and I work off hours often so have the road much to myself at 2am or 5am coming home or going in respectively. I also have a 5 mile commute to drop off kids at school that has 5-6 stops that I can consistantly get 60-70mpg on with good conditions.
     
  14. ystasino

    ystasino Active Member

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    <div class='quotetop'>QUOTE(efusco @ May 15 2007, 09:38 PM) [snapback]442920[/snapback]</div>
    I manage 60mpg going downhill to sea level on an 8 mile 20 traffic light trip, but driving back I slip to 45mpg :(

    Your posts make me want to walk to my Prius at 130 am and start driving it for 50 miles in the back roads driving like a slowpoke and seeing if I can reach anywhere near 60mpg. In fact I'll go do it right now and report back in an hour! I need to know if its the traffic the lights the break-in period or my driving...well in perfect traffic conditions and without being in a rush I managed 64 mpg over 26 miles.

    Congrats on your inspiring tank!
     
  15. Darken

    Darken Active Member

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    <div class='quotetop'>QUOTE(Darken @ May 15 2007, 12:03 PM) [snapback]442453[/snapback]</div>
    Well to update it looks like the mileage varience catches up over the life of the tank as now I am up to 545 miles with a pip remaining (60.1 MPG) I don't think it will be a stretch to hit my first 600+ tank! I'm a long way from the masters at 72 MPG though...