Prius (2010-12) Fuel :: MPG Fluctuates With Weather
Sep 26, 2010
Well, for the past few weeks the weather in Los Angeles had been a little on the cool side. I didn't notice the cooler weather, but I noticed that the computer says I was getting around 51 MPG for almost the entire tank (the warning was blinking so I think I used about 10 gallons).
Then today, the temperature rose to around 90 degrees. I noticed the heat. All of a sudden, my computer MPG rose to slightly above 52. I think that would be difficult to do as it must average out the entire tank an extra 1 MPG. And correct me if I'm wrong, but if I got 51 MPG over 10 gallons of gas, in order to raise the gas mileage by 1 MPG in the next gallon, I must get around 62 MPG for that last gallon.
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I don't have a lot of data yet, but the last couple of times we had temps over 80F, my mileage took a significant hit - about as bad as when temps are below 20F (more than 10%)... Shutting off the A/C doesn't change things much...
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On a hot sunny day, occasionally I have to be stopped for extended periods with the A/C running which means the engine will come on for a few minutes out of every 10 minutes or so. to charge the traction battery. Engine comes on at 2 bars and goes off at 3 bars.
As engine efficiency at idle is low, would it be better to put it in D with the brake firmly pressed and push the accelerator so that the engine speed is in the high efficiency range so as to produce more charge for the fuel burnt and maybe also I could charge it to a few more bars on the battery indicator?
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I have noticed that due to warmer weather and more Prius C owners that the MPG's are going up. No many in the 40's mpg anymore. I enjoy people posting and obtaining over the EPA of 50 mpg, the 60 mpg figure appears to be fairly easy
to obtain with the Prius C.
On our Prius the last mpg was 52.3 calculated this is real world driving with my wife driving 75% of the time and she does not drive strictly for MPG's.
I believe we should all take a minute and pat ourselves on the back as all the countless gallons of gas we our saving and will be saving for our friends and neighbors who have no choice but perhaps to drive large cars and pickup trucks...
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Here in the northwest the weather has been dry and temps in the 40's to over 60 degrees. The mpg's have increased about 5-7 mpg over just a month ago.
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I just got a 2005 Prius, it is getting about 40-43MPG in 50F weather. This is my first time with a hybrid, much less a Prius. Is this normal for this car in this weather, or does something seem wrong.
The 12V seems to be getting about 11.7-11.8 under load.
Tire pressure is about 33PSI, going to increase it most likely from the sounds of other people having it higher.
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My fuel gauge fluctuates once I turn the key to Acc, once I fire it up it goes back to empty and climb back to the correct position,
Also once this happens, my MFD starts to act crazy, sometimes it shows nothing, and times gets stuck on the door open screen and my steering wheel controls go dead, if I turn off the car and then on its gets stuck "Volkswagen information" screen.
I disconnected/reconnect the battery everything went fine for a couple of days and then happened again,
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I think I'm getting the hang of this car after 3 months. My mileage has been steadily increasing as the weather has gotten warmer and as I've adjusted my driving a bit. If I drive fairly normally i get about 55 mpg (HSI, ~52 mpg actual). If I'm more careful I get closer to 60 mpg HSI. If I'm really careful I get over 60. My last tank was 61.8 (HSI), and 59.6 mpg from the fillup (see attached). I put 10.13 gallons in the car for 604 miles. I call that 60 mpg, and I'm pretty pleased. This is for a week of normal commuting which includes lots of hills, about 1/3 surface streets, 1/3 state highway, and 1/3 interstates with occasional stop-and-go. It is pretty hot here these days so the AC runs constantly. I have only seen my mileage get better with time so I haven't seen it roll over as the weather has gotten really hot, but that may be that any affect is counteracted by my learning to drive this car.
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2003 f250 6.0 had a no start issue at first which ended up being bad connection/ chaffed wire at ficm.. ive replaced regulator with blue spring, new oil/fuel filter housing, new Motorcraft filters, and a orileys fuel pump.... guage i have reads 55psi at start up. While accelerating it obviously drops down, but it seems to goto 40 to 45psi then back to 50..then at times it goes back down while driving and stays around 40 45psi regardless if accelerating or coasting etc. Then after couple mins when i accelerate it will go back up?
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For the past couple weeks on the way home from work the ICE runs non-stop for 20+ miles. My drive is 25 miles and the weather has been 105+. In the morning everything seems to work fine. In the afternoon even with the AC off, battery almost fully charged the ICE does not shut off at all even at a stop. I even tried putting it in EV mode and it tells me Not Currently Available. My Prius is a 2012 3 with 5500 miles. Is this normal in hot weather or is there something wrong??? Also the mileage sucks, in the morning with the AC on, weather around 90 I get 55-58mpg. In the afternoon I get low 40's even with the AC off.
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I've been driving my 2012 elantra for 3 years now, and the average mpg (on the screen) fluctuates anywhere from 18 to 25 during any given trip (I don't take long trips - after 3 years I only have 14,000 miles on the car). I rarely drive on highways, so I'd expect the average mpg to be in the lower range -- but my lease is up and I'm trying to figure out if this is just a gas guzzler or if there's some malfunction of this tool, or if it's something inherent in the way I'm driving.
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Uneven throttle response during cold weather engine warm-up? When sub freezing weather arrived a few weeks ago my 2010 Prius developed uneven acceleration during engine warm-up. The car was purchased in October and it ha less than 3,000 miles.
Gradual depression of the accelerator results in a very small, tiny in fact, amount of increasing power to the wheels, not in proportion to the usual smooth and responsive amount of cold starts above freezing temperatures.
Continued depression leads to a point about halfway to the floor when the engine, which of course has been running all along, suddenly surges and the car takes off with a jolt of power. Not smooth, impossible to control well and unacceptable. Many would say this is unsafe.
My 2005 Prius never had, and my wife's 2007 does not have this issue. Could be a cold weather related accelerator defect as with the Camrys, but this is not mechanical sticking as was the case with the Camrys, its an electronics error like a faulty sensor or cold start injector.
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In our recent -20 F cold spell in Chicago, I noticed the ride got very stiff, have others experienced this in very cold weather? My theory is that the oil in the shocks or dampers become extra viscous at these temps and the cold shocks causes the ride to becomes like that of a Honda Civic with a dropped suspension. (It's so amusing to watch those Civic "low riders" going over railroad crossings, but it's all image right????)
Anyway I would think the colder temps would lower the air pressure in the tires, softening the tires a bit, but perhaps the rubber hardens counteracting that benefit. I have Michelin Primacy BTW. Since temps went back up above about +10 F ride seem to be OK again.
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I read about the white smoke and I found that is normal in cold weather!! Is that true and what do you think ?
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When I purchased my car last year I ordered it with the remote starter. It works great unless the weather is 12 degrees or colder, then it will not start the car. This morning I tried to remote start, it started it for 2 seconds then shut off, I did it again with the same result. I then went out and physically started the car and went back inside only to go out 15 minutes later to find the car stopped running but the radio was still playing. I then restarted the car and again went back inside 15 minutes later the car this time it was still running and was just starting to melt the ice on the windows. I have had issues in the past with the remote starter not working but today I actually went to the door and listened to what it was doing.
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I have had my 2011 Elantra limited since April. I always have the ECO mode turned on. The light fluctuates when driving as I excepted to. I know the actual mode/light doesn't really do anything, but in the last months or so, it will light up shortly after starting the car and work normal but then decide to not light and never come back on until the car is restarted. I have checked numerous times and the ECO mode is ON.
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I have a 2006 Pri with 194,000 miles on it that has been dead reliable & owes me nothing really, now developing a serious problem. Only when it is below about 10 deg F I will get total failure of the power braking system on or shortly after startup Has happened on 3 days this winter. ABS light, Brake warning, continuous high pitched beep (very annoying warning the driver of immanent death!
When this happens I get almost no movement on the brake pedal. It's rock hard & acts pretty much like loosing power brakes on any car (ie. you will eventually stop, but not a safe condition). There is no transition to this condition. It's either "everything normal" or total failure. Brake fluid reads half way between min & max and looks clean, no sign of moisture, but has never been flushed.
The last time it happened I was leaving work, couldn't swap cars... so I drove straight to the dealer (white knuckled). Dealer calls the next day saying it's the Brake Actuator needing replacement. I told them I wasn't spending that & to look again for a cheaper problem like Fluid, 12v battery, Relay...
No dice. They confirm it's the actuator.
The code they read is C1256. They "checked resistance at actuator pins & found high resistance at pins 1&2." I'm thinking about just topping up the fluid a bit more, or getting the fluid flushed & changed, or changing the 12v battery (I need to check voltage on next cold morning), or just not driving it at those temps & hoping it doesn't get worse.
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Why when I am in hot weather it takes a long time for the a/c to start cooling off the car...
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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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I am new to the prius 2010.
I filled up last week and I noticed that as soon as a single cell display in the fuel display part has some empty section like 3/4 fuel(single cell) the next day or after that that whole cell disappears without it showing that single cell as being empty.
Around which fuel cell, when displayed, is it important and recommended to fill up gas again, with one cell remaining or two etc.
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When I go out to do errands around town (I live right in town) I get horrendous gas mileage. Now, I understand gas mileage is high at the beginning of a trip, but for this long and this high and under these circumstances? I'm getting ABOVE 10l/100km when I have 80% charge available (for americans, that's disgustingly high MPG like, pick-up truck high), AND my foot is completely off the gas. Literally, coasting, or braking, and I'm still sucking up gas. What the heck?
Is this just because it takes a certain amount of time for the engine to run no matter what or something? I still don't see any reason for me to be eating up all that gas when my foot isn't even on the gas AND most importantly, I have charge available. Feels pointless for me to use my car for what I use it for 70% of the time, which is for quick errands around town at low speeds. Thought the prius was suppose to be a superstar for this kind of thing.
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