Prius (2004-09) Fuel :: Calculation Of MPG At Stop
Jun 5, 2013
I understand that the EPA may not consider stops at traffic lights, but when cars are stopped with their engines running, gas is still being used. I suppose this may be one of the reasons why we get worse gas mileage numbers than what they claimed to get. Or is the amount of gas being consumed extremely small and not worth adding that factor in? If you were to calculate your gas mileage with each fill-up, that is taken into consideration.
But with a Prius, or other hybrids, the gas engine is oftentimes off and not using fuel when stopped. Again, when calculating mileage with each fill-up this gas consumption is part of that calculation.
I know that you can't really calculate mpg for a car that is not in motion, but there must be a clear advantage of having a hybrid when stopped at lights, etc.
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This chart compares what my C's computer calculated for MPG to simple arithmetic. Seeing consistent optimistic numbers from your computer like I am?
The average error is -2.7 mpg and the STD is 0.85 mpg. So the error is fairly consistent. I also have shown the gallons purchased, but there is no correlation to mpg error.
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For the average mileage calculation that appears in the odometer screen, what resets it? Seems that it self-resets at 1,000 miles. Is this correct?
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Took my 2005 Prius for an oil change. Dealer called and recommended fuel injection service because of carbon buildup and mileage (50,000). On my way home on a mild day with heat and AC off it didn't shut off at stop lights all the way home. Battery was charged. Never had this happen before and it's demoralizing because I really love my car!
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How accurate is the calculation from the car's "computer" for the cruising range left?
In my experience from my previous vehicle. When my gas light would come on, I believe it generally meant that I had 2 gallons left in the tank before stranded.
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I took my 2008 Prius to Jiffy Lube to have oil changed. When driving away, I made it about one block and all warning lights came on: Master Warning, Hybrid System Warning, Brake System Warning, Malfunction, etc. I pulled the car over and stopped. I started the car again, lights still there - drove 2 blocks back to Jiffy Lube and lost momentum about one block away, with pedal to floor, I could drive about 5 miles an hour into the bay. They looked at it for about 30 minutes and claimed I had bird seed that dropped under the air filter.... I said "goodbye" called AAA and had it towed to my dealer. They said it was because air had entered the system due to my being low on fuel. I have never heard of being low on fuel and it causing the car to shut down nor did I ever get a warning of low gas, still on one bar. Each time I restarted the car at Jiffy Lube, it started fine, drove forward or backward, then lost momentum again. Still no warning of being out of gas. The ticket from the dealer states:
"Vehicle low on fuel causing ECU to shut down fuel injectors when engine started to misfire. Found codes P0A0F, P3190 in system. Added 5 gallons of fuel and reset ECU."
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I have a 2008 prius. Usually it gets me around 52-55mpg, I've had it since January. Since a couple of days ago its not giving me anything above 49. I know thats a normal number, but considering the fact that its usually quite a bit higher I'm wondering what the cause of the drop is. Also around the same time, when I pull out of my driveway I notice what appears to be a bit of water leakage. Its under the vehicle in the front center, and it only happens when I start the car for the day and pull out of my driveway (its on an incline).
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I have read that when accelerating from a full stop, it is better to accelerate briskly, but keeping the bar graph in the ECO zone, to cruising speed is better overall for gas mileage compared to accelerating slower and taking more time to reach cruising speed....
I have also heard that it is better to accelerate using the bar graph and making sure it only goes half an inch past the ECO display above it. This way uses less RPM.
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Just got a (second) 2012 RX350. 13,000 miles. The Distance to Empty is confusing me. Doesn't come close to matching the tank size times either the mpg since last fill-up, or the overall average mpg. Overall mpg is 17.x. mpg since last fill-up varies from 17-21. But when I fill the tank, the DTE says maybe 260. With a 20gal tank the DTE after a fill-up should be in the 340-350 range.
This isn't happening on our other 2012 RX350 with about the same number of miles.
The needle gas gauge appears to be right, based on where the needle is before a fill-up and the number of gallons purchased.
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This morning I was playing around with my 2010 Prius "B" mode - I realize today that when the Prius CVT is in "B" mode the Prius ICE won't turn off even when it is at a complete stop -- instead the ICE runs/idles at a 996 RPM / .20-.40 GPH while stopped in traffic. The coolant temperature (@190F ) doesn't matter, Battery State of Charge (54% soc) doesn't matter. To re-enable the stop-start idle technology - I had to switch the Prius CVT back to "D" mode. I end up burning a bit more fuel on this trip because it took me a while to realize that I was in "B" mode and that the stop start idle technology had disabled in the "B" mode ...
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I just bought another 1991 Ford. This one is a 1/2 ton XLT Lariet with the 302 and for the first time I own a short bed. I also have a 1991 F-250 XLT with a 460 and a 8' bed.
Here is the problem, ( I think) it will not run or at least not for long. The fuel pump, which I am guessing is in the rear tank will not stop running. On the F-250 the pump stops running after a few seconds after I turn on the key.
Where should I start to find out my problem with the fuel system?
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I have a 95 F150 4x4 reg cab long box with a 302 V8 and dual tanks... I was driving around yesterday when my truck started to lung and then the motor stalled... when I stopped moving I tried starting the truck and it started with no problem, so as i kept on my way, about 5 minutes later the same thing happened and it stalled again, (I have an automatic by the way). but this time before it stopped moving i pump the gas a few times and it fired back up and then stalled again... i switched from my front take to by back maybe thinking it could me my fuel pump in the tank but it did the same thing again about same time later... Would it be my fuel filter on the frame (like in line fuel filter) or why is it doing that? its EFI by the way.
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Hearing non-stop Pump sound ??
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2007 would not start this morning.. Took out the service plug and replaced it, and it starts.. Now it wont start again and I get some random clicking, and the warning lights (triangle and hybrid warning on the MFD). The plug is installed properly!
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I was driving down a stretch of freeway that sloped down, took an exit, and rolled to a stop at a red light. The traction battery indicator was at full. While waiting for the light to turn green, the ICE would come on for a few seconds, turn off for a few seconds, turn on again, doing so for the minute or so until we started moving again. What was happening.
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We have owned our 2008 Prius since new so when it misbehaves we know it.
Starting yesterday, when accelerating from a stop light we would be on electric ONLY. The ICE would not even TRY to start. There were NO fault lights or other indications. Then the ICE would run a bit and stop and sometimes begin to act almost normal. We watched the HV battery charge go from 3/4 to one bar in a matter of minutes.
We limped it back home, the ICE was running so we let it run until the battery got up to three bars and he ICE shut off. Then we got in my 05 Prius and finished the task at hand.
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I have a used 2007 Prius (my dad owns it) that I've been driving for a little over two and a half years. I can't remember exactly when it started, but my car has this issue where, if I make a turn from a stop, it cuts out a few times. Like, if I'm sitting at an intersection waiting for the light or traffic to clear and step on the gas to turn, it'll go but lurch about 3 or 4 times in the process. It scares the heck outta me because I never know if I'm going have enough speed to make the turn without causing an accident, so I wind up waiting for completely clear lanes, which annoys the drivers behind me.
It happens randomly, there's no guarantee it'll happen every time. It's more frequent when turning right. I've told my dad about all this, but when he took it for service months ago, he said they said that it was normal (sounds fishy to me). So here I am now, the problem's still there, so I tell him and he decides to get new tires for the car. Those came, but they didn't fix it.
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Am a recent owner of an '06 Prius and like the car so far. The only fault is something I have never run into before. The brakes are very sensitive when coming to a stop. I find it almost impossible to feather the pedal and make the stop comfortable.
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I notice the brakes are very grabby right before you come to a complete stop. This seems to occur more when this brakes are cold. Is this typical with the gen 2's? Mine in a 2005 if that makes a difference. So far with 2k miles on the car I'm not a big fan of the brakes, but everything else I love.
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This morning I realized that there is a pattern to our Prius incidents. What Sarah experienced last week is the same that Amy experienced when she drove the car the first day we bought it.
1. January: Amy had driven 20 highway miles with no problem. Park for 10 minutes. Started and crossed to the median of a two-lane Highway. stopped to wait. When tried to go, nothing. Will not move. 10 minutes later tried again and car worked fine for a long time after that.
1a. The car still had the original auxiliary battery. tested and found 12V battery weak. Replaced original battery with Duracell AGM vented battery for Prius. Car drove fine for weeks after this.
2. May: car sat all day. Turn on. Drove across parking lot. then noticed red triangle, VSC, brake warning lights all on. Lots of codes including high-voltage battery, transmission, and others.
3. drove fine for one week. Then going 60 miles per hour up a slight hill. heard the internal combustion engine shutdown. Red triangle, VSC, brake warning light came on. Reduced or no power steering or brakes. Coasted off the road. After 10 minutes, it drove fine again.
3a. I cleaned high voltage battery cooling fan. Drove fine for 10 days.
4. June: Sarah drove 10 minutes. Drove to stop sign. Had to wait 5 minutes for lots of traffic. When ready to pull out, push the accelerator, internal combustion engine shut down and the car would not move. Would not go into reverse. Put in neutral, and enough slope to roll backward to side of road. waited a few minutes, and it drove fine again.
Codes WERE P0A0F engine failed to start and c1300 anti-lock brake. the same codes were thrown in the previous incident. Noticed engine coolant a little low and added more.
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I have about 05 with 110000 miles on car and have started to notice that the motor sounds like it is revving up when I come to a complete stop or even hyper miling. I have plenty of juice in battery Not Green and Not Orange. While at a complete stop if I switch from Park/drive/Neutral some times it will then shut off.
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