Prius (2010-12) Fuel :: Temps Have Been Dropping, MPG Dropping As Well
Grill blocked today for the first time and have a couple questions.
Temps have been dropping more these last 3-4 days and have noticed my MPG dropping as well so I thought I'd try grill blocking.
Tempts have been and will be high 30s-low 40s in the morning and upper 50s to mid 60s for the high.
At first I just wedged the pipe insulation and drove one trip. I didn't feel comfortable that it would hold for the long haul so I added zip ties.
I used two pieces of pipe insulation 1/2 inch copper / 3/8 inch iron. Up close it looks like 2/3 or 3/4 of the grill is covered.
My two questions:
For fWT, at what temperature should it not exceed?
At what outside temperature should I remove the pipe insulation? In the Phoenix area, temperatures rise in March and sometimes we will have a short period of warmer than normal temps in February. I just want to make sure I do not cause overheating.
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While most of the emphasis I've seen on improving fuel economy seems to focus on warming the car up quickly in cool/cold weather, I seem to be experiencing significant mpg drops at the other end of the spectrum.
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Last October I needed new tires, so I had Michelin Defenders put on my 2011 Three in place of the OEM Firestones. The Michelins perform well and are nice and quiet, but...
My gas mileage (both indicated on the dash and calculated) has dropped by about ten percent. In researching the two brands of tire, I found that the OEM Firestones are rated at 836 revolutions per mile, and the Michelins are 839. I'm wondering if this is the reason for the apparent change in mileage.
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=this is my first summer to own a prius, and I noticed this last week that my fuel economy seems to be slipping. I am averaging around 42 MPG instead of my usual 49. Only reason this worries me is I've noticed the car is charging the battery a LOT, and it's not uncommon to have my MPG drop down to the low 20's on a flat road if I am lightly accelerating.
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I currently have 2400 miles on the Michelin Energy Saver A/S. These are the MPG stats, manually calculated.
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Average: 48.2
Lowest: 45.0
Standard Deviation: 2.4
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Highest: 50.1
Average: 42.7
Lowest: 37.0
Standard Deviation: 2.6
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This Easter I put summer tires on my "new" (owned about 4 weeks) prius -07, and cleaned and greased brakes.
With winter tires (almost new Nokia hakka xx, stud less) I got 4.5 l/100km (52mpg) easy and 4.2 (56mpg) at best, now I get 5.5 (42mpg) and 5.3 if I struggle, if I relax and put cruise control on I get 5.8 (40mpg). I travel 100km to work every day.
Summer tires is Michelin primacy (about 2 seasons?) pumped to 3.0/2.8 bar (over inflated).
Brakes don't seem hot after drive and they was really clean and easy to move after my service so my guess is that they work fine...
Mileage went down over the weekend so I see a clear link.
It was more fun trying to hypermile at 56mpg aiming for 60 then it is at 42 aiming for 45...
12v battery charged, just in case. Still same temperature out 1-8 C. Oil and all filters changed first week (will change trans axle oil in summer). Travel to work got 4% shorter so tire size must be a small reason to the +20% problem.
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