1. Offline

    cyclopathic Senior Member

    Member Since:
    Apr 15, 2011
    Posts:
    1,497
    Likes Received:
    174
    Location:
    suburbia
    Your Vehicle Year:
    2010 Prius
    Model:
    II
    The temps got up we are expecting ~80 for next 8 days with mid-50s for low. Probably not warm enough to unblock grill yet.

    50% of lower grill blocked at Nov oil change, and the avg MPG through winter was 58.4 calculated.
  2. Offline

    revhigh MPG Enthusiast

    Member Since:
    Jan 2, 2011
    Posts:
    984
    Likes Received:
    133
    Location:
    PA - Pocono Mountain Area
    Your Vehicle Year:
    2010 Prius
    Model:
    II
    Still fully blocked on bottom Here in PA, even though it's 70 degrees today. Still no issues. I think I could leave it blocked all year according to temps on scanguage.

    REV
  3. Offline

    smokiejoe Member

    Member Since:
    Jan 1, 2011
    Posts:
    156
    Likes Received:
    19
    Location:
    PA
    Your Vehicle Year:
    2011 Prius
    Model:
    Four
    No Scangauge here, so I pulled off the foam pipe covering last week when temps got close to 70F, just to be safe.
  4. Offline

    JimboPalmer Tsar of all the Rushers

    Member Since:
    Apr 14, 2009
    Posts:
    7,249
    Likes Received:
    2,147
    Location:
    Greenwood MS USA
    Your Vehicle Year:
    2012 Prius v wagon
    Model:
    Three
    I did not block this 'winter', never had any cold days.
  5. Offline

    fuzzy1 Senior Member

    Member Since:
    Feb 26, 2009
    Posts:
    6,548
    Likes Received:
    1,589
    Location:
    Western Washington
    Your Vehicle Year:
    2012 Prius
    Model:
    Three
    Still fully blocked here. A warm snap has pushed the porch temperature all the way up to 44F. A hint of snow down here yesterday, pouring rain today, both mountain passes closed for avalanche control.

    With a ScanGauge and a very cool summer last year, I didn't remove the last half of the grill block until traveling east of the mountains in September. And it stayed out only two weeks. But as usual, our Pacific Northwest weather was the opposite of what most the the country was experiencing.
  6. Offline

    J5A Active Member

    Member Since:
    Jan 7, 2011
    Posts:
    592
    Likes Received:
    81
    Location:
    Severna Park, MD
    Your Vehicle Year:
    2010 Prius
    Model:
    IV
    Pulled blocking off yesterday when temps got into the mid 70's.
    Will store the material in the trunk's under-cubby.
  7. Offline

    MJFrog PHEV Disabled - cold weather

    Member Since:
    Jul 21, 2009
    Posts:
    762
    Likes Received:
    241
    Location:
    SE Michigan
    Your Vehicle Year:
    2004 Prius
    Model:
    N/A
    Pulled my grill block completely this morning. Highs will be 70F+ for the next week or more. When doing highway driving my scangauge shows fWT is exceeding 205F. Not sure if that is critical, but the scangauge does NOT show inverter temp and I have no desire to replace an expensive part like the inverter.
  8. Offline

    SSPigboat New Member

    Member Since:
    Mar 3, 2012
    Posts:
    13
    Likes Received:
    0
    Location:
    Illinois
    Your Vehicle Year:
    2012 Prius
    Model:
    Four
    Is this something that's required to be removed? I don't rember reading about that in the owners manual.
  9. Offline

    walterm Member

    Member Since:
    May 17, 2007
    Posts:
    293
    Likes Received:
    47
    Location:
    NJ
    Your Vehicle Year:
    2010 Prius
    Model:
    IV
    No, this is something that those of us who are upset with lower mileage in colder weather do to mitigate the effect cold has. We block off all or most of the air inlet grills to keep the cold air from cooling off the engine too much and causing it to have to run more, lowering MPG. The trick is in remembering to remove the block when the weather gets warmer so as to not overheat the engine or electric inverters. A Scanguage can be used to watch the engine and inverter temps, but you have to remember to watch it.
    1 people like this.
  10. Offline

    Sabby Member

    Member Since:
    Sep 17, 2011
    Posts:
    225
    Likes Received:
    74
    Location:
    NY
    Your Vehicle Year:
    2011 Prius
    Model:
    Two
    Took it off earlier this week as I saw the temps rise toward 70's. With the warm weather I have seen a nice mileage jump
  11. Offline

    wick1ert Senior Member

    Member Since:
    Dec 3, 2009
    Posts:
    1,315
    Likes Received:
    178
    Location:
    Delawhere
    Your Vehicle Year:
    2010 Prius
    Model:
    III
    I've still got half the lower blocked here. I removed the other half of lower this week when we hit 70s for the high. Still a chance I'll have to put it back, but I think we're mostly out of the really cold temperature range here, except maybe the random low temp here or there. At this point, I'll probably remove the last piece in a couple weeks.
  12. Offline

    cyclopathic Senior Member

    Member Since:
    Apr 15, 2011
    Posts:
    1,497
    Likes Received:
    174
    Location:
    suburbia
    Your Vehicle Year:
    2010 Prius
    Model:
    II
    It hit 84 here, and we less then 100mi apart. I probably remove mine when I need A/C.
  13. Offline

    szgabor Active Member

    Member Since:
    Jul 29, 2009
    Posts:
    757
    Likes Received:
    113
    Location:
    Oceanside NY
    Your Vehicle Year:
    2012 Prius
    Model:
    Two
    I went full blocking from mid-winter till last week.

    Now full blocked down grill and removed upper.

    I am monitoring with scangauge-E the water temp and I found that with full blocking ... the afternoon I was reaching 195-198 very quickly and even gliding would not cool it down ... put on the heater and open the window (it was a few 50+ days here in NYC)

    Since mid last week I am running lower fully blocked. I found that this is safe if you can monitor your temp till you would need AC (see another thread about why).

    The morning gains still worth it ....

    If you have no way of monitoring I would not recommend this when average daily temp gets to mid 60s...
  14. Offline

    szgabor Active Member

    Member Since:
    Jul 29, 2009
    Posts:
    757
    Likes Received:
    113
    Location:
    Oceanside NY
    Your Vehicle Year:
    2012 Prius
    Model:
    Two
    WOW nice mpg !!! my calculated just shy of 50 ... how are you driving like that

    I listen Marley (if I am alone in the car ... that is the only CD ....) So maybe "I am running like lion in Zion" too much

    Nice avatar !!!
  15. Offline

    ItsNotAboutTheMoney EditProfOptInfoCustomUser Title

    Member Since:
    Jul 18, 2009
    Posts:
    2,272
    Likes Received:
    436
    Location:
    Maine
    Your Vehicle Year:
    2010 Prius
    Model:
    II
    Average high for time of year around 40F, average low is 20F, but the temperatures have been above average, although the mornings have mostly been high 20s or low 30s with just an occasional day in the 40s.

    Because of the higher-than-average temperatures I might take off one of the Advanced Warm-up Assistance Devices for the weekend, just to be absolutely safe since I'm not monitoring temperatures.

    (Nearly back up to 50mpg this last tank. I'm sure I would have done with summer tires on.)
  16. Offline

    szgabor Active Member

    Member Since:
    Jul 29, 2009
    Posts:
    757
    Likes Received:
    113
    Location:
    Oceanside NY
    Your Vehicle Year:
    2012 Prius
    Model:
    Two
    This is your car but you can easily leave it .... Prius III has additional fans to help cooling which engages around 195-198 ... (of course blocking lower the efficiency of that ... )

    Unless you are running under heavy load (many passenger or stuff or a lots of uphill ) you should be just fine till mid-high fifties during the day .. the morning (and possibly late evening gain well worth it) also if you drive several shorter trip rather than 50 mile highway each way ....

    Again this is your car...

    Cheers
  17. Offline

    cyclopathic Senior Member

    Member Since:
    Apr 15, 2011
    Posts:
    1,497
    Likes Received:
    174
    Location:
    suburbia
    Your Vehicle Year:
    2010 Prius
    Model:
    II
    part of it the speed limit on my 15mi commute is 35-40-50mph and with speed traps it does not make sense to drive much over. Other part is Michelin Energy Savers, higher pressure, ECO and partially blocked grill.

    yes it is Bob Marley (hope noone assumed it is me!) it is been a while since listen to reggae, I go through phases. I've been listen to blues lately..
    1 people like this.
  18. Offline

    JimN Let the games begin!

    Member Since:
    Nov 26, 2006
    Posts:
    5,264
    Likes Received:
    395
    Location:
    South Jersey
    Your Vehicle Year:
    2010 Prius
    Model:
    V
    I keep the bottom blocked year round. I pulled all but 1 piece (each side ) from the top when OAT started reaching into the 50's. Coolant temp isn't the issue as fully blocked it wouldn't get above the mid 190's even in the summer. However, inverter coolant temp rises dramatically. "Normal" inverter temp is ~ OAT +20. I'm looking to keep inverter temp under 100F.
  19. Offline

    szgabor Active Member

    Member Since:
    Jul 29, 2009
    Posts:
    757
    Likes Received:
    113
    Location:
    Oceanside NY
    Your Vehicle Year:
    2012 Prius
    Model:
    Two
    Just curious how can you get that info ??? I would be very much interested because heat is a HUGE factor of electronic "ageing"

    Cheers
  20. Offline

    F8L Protecting Habitat & AG Lands

    Member Since:
    Aug 14, 2006
    Posts:
    18,629
    Likes Received:
    3,695
    Location:
    Sacramento, CA.
    Your Vehicle Year:
    2013 Chevy Volt
    Model:
    N/A
    I can't do any grille blocking until I get the new tires broken in and all the gas mileage testing completed or I'll skew the results. :(

    I took the grille blocking off the GENII last month when temps were creeping into the high 60s.

Share This Page