Prius (Gen 1) :: MPG Dropped After Some Maintenance
Jul 22, 2011
My 2007 Prius has about 105,000 miles on it. For awhile I was getting around 41-42 MPG which I thought was a bit on the low side, but the dealership never found any problems. I had the recommended 60k service done then after that stopped going to dealer for routine maintenance like oil changes and such. Lately though, my MPG has dropped to around 37. I use Chevron gas all of the time and I keep up with my oil changes. I try to also make sure my tires are inflated properly.
They had a special on oil changes at the dealer so I asked them what they thought might account for the drop in mileage. Their initial thought was cleaning out the fuel injectors. I do change my own air and cabin air filters.
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I have 2600 miles on my 2012 mdl II. A month old. I have been averaging 47.5mpg since day one based on miles driven and gas put back in tank at each fill up. I have used only Mobil bottom 87 oct gas.Last fill up got me 48.2, very nice, then I filled up with mid grade 89 oct as it was all I could get then. The next day I was in the dealer for my 1000 mile checkup. when I got out my battery was down to 25%, okay no biggie. Then from there on out I notice my mpg changed alot. The comps used to read 49.1-50.1. Now it reads 42.2-44.1. I drive the same way and my 85 mile round trip to work hasn't changed. My first fill up since the dealer, got me 45.0 mpg. wow a big drop off.
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On my battery poles I measure like 12.8v, my scangauge reports around 12.4v/. I have an additional voltmeter connected to the cigarette lighter cables & same thing there: 12.4v. The voltage go down soooo much. My first thought was that my battery is not getting fully charged, but after measuring directly at the poles, it's obvious that the voltage drop happens on the way.
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2011 Prius for wife. Mileage has always been upper 40s to low 50s until the last week or so, now she is seeing 35 mpg displayed.
I have asked for a check at fill up. I just pulled the car out to wash it and noticed the engine came on right away, same when I put it back into the garage. In the past we would get part way down the driveway before the engine came on. Also did a code check and no codes found
What are the approximate outside air temps? 40s am 70s pm.
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Well I shouldn't say MPG since we canadians use L/100km.
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My Father In Law bought a 2012 Prius C last year in Houston, they are from El Paso. The car drove great for many months, he takes the same path to work and same speed every day and was consistently getting over 60 mpg. All of a sudden winter came and he lost MPG and the engine would come on more often, even while parked. I own a 2009 Prius and told him mine did that too during the winter, because for some reason, during winter the battery drains while parked and the engine comes on to charge.
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The engine light went on and I took it to my mechanics who is good on everything except Hybrid system.
Immediate after the lights on, I filled gas and the mpg dropped to 31, soon back to 37 on a hot day 85 degree. At red light, I feel the engine still running, not very smoothly. But the next day, it back to normal, mpg also back to 48 something.
My friend has a 2005 with 140K also got the same code. His mpg dropped to 40 and feel that engine power is lower now.
I would like to know if this is a common problem, what's the most probable cause, and if there are many possibilities, what's the best way to approach.
Here is problem area by OBD-II:
Engine and ECT
Hybrid Control
ABS/VSC/TRC
Air Conditioner
Immobiliser
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We recently got back from a 2800 mile trip. Our v now has 10,600 miles on it. We have been averaging 41 mpg until the last two tank fuls. For some strange reason we got 34.5 displayed on our last tank, 32 actual, and right now after 90 miles we are showing 30.5 displayed. My wife drives the car 98% of the time, but even when I use hypermiling techniques the car is not yielding the past displayed results. We are about to take it in for the 10,000 oil change.
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I've had my car going at 45 mpg the past 2 years. I just hit my 45k mileage mark. I drive mostly on the highway to work so getting 45 mpg is pretty good for me. This last few fill ups, I noticed my gas mileage has gone down to 40 mpg. I thought it was a mistake if it was just once but the last 7 fill ups has been that way. It just went down all of a sudden and has stayed that way.
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so I recently had my 2012 Prius in for oil, tires and alignment. I was getting 55mpg all day and now I can't keep over 45mpg. Tire press is 38 all around with Goodyear assurance. Could the alignment be off causing higher rolling resistance. Maybe wrong oil.
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I have Prius 2010 and I was getting 20 km/l to 22 km/l until I repaired the part which is between two tires and when you revolve your steering it revolve due to that rod. Right after I drive my car as I came out of workshop, it seems that my engine keep running more and turn off less.
1- Can I check if my Hybrid battery is getting weak or what is the health of my hybrid battery ?
2- Is there any way if I can check my front tires are revolving without any friction and revolving freely ?
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I have an 05 Prius that I bought used. It has 59K miles on it. Recently I took it to the dealer for an oil change. They told me it didn't need an oil change, but did need an air filter. Afterwards, the mileage dropped from about 47 around town to about 42. Had the oil changed a week later, and the mileage is now about 40 around town. The dipstick when cold shows a little above the full mark.
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So I met my wife after work. I was killing some time with my son. We drove across the street, then to a neighboring shopping center. I changed the display to see the more accurate instant MPG and noticed my battery was at 2 bars. This is the first time that's happened, that I'm aware of. During normal operation, it stays at 2 bars above the halfway mark, or above.
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We picked up our 2009 prius about a month ago from a local dealer. At the time it was getting about 52 miles per gallon. Since then, we have driven about 1000 miles and now we are getting only about 41 miles per gallon. Are we doing something wrong that made the MPG drop over 10 miles per gallon.
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My neighbor stopped me this morning saying her 2005 prius was acting up.
When we started off the MFD was showing all blue bars, ac lights radio all turned off.
Drove less than 3 blocks and it dropped to one purple bar and had hesitation on acceleration.
Went around the neighborhood about 3 miles and it was showing full charge green , parked and restarted, it dropped to all blue bars.
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The last few days with snow and temps dipping below, my mileage has dropped significantly to high 20s/low 30s. I understand that (a) I park my car outside, (b) warm-up my car during the time I clean the snow, (c) no EBH, (d) no grill blocking, and (e) my drive to work is only ~15 miles round trip, but still mileage in the high 20s/low 30s is lousy, even lower than my break-in mileage (30s) that occurred in Jan. Even, my 1995 Corolla with 150k miles also gives about mid-20s during the winter with identical driving styles and conditions. So what's with the Prius?
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Up until my last oil change at 105,000 miles, I didn't notice any oil usage. When draining my oil, it didn't look like it was quite 4 quarts. After the oil change, I ensured that I had the engine EXACTLY topped off to the upper mark on the dipstick. Around 600 miles later, I parked in the same location and have noticed that the oil level has dropped enough to notice.
I am guessing that I will lose well over a quart between oil changes. Before I resign to the normal mechanical reasons (rings, cylinder wear, etc.), The loss doesn't seem to be gradual which has me looking for other explanations. I also had a Toyota mechanic go over the car and replace the other fluids and filters at 100,000 miles (coincidence I think ).
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I have noticed a significant (15 to 20%) drop-off in mpg in the last 6 months or so. My 2006 prius at 95,000 miles is just short of the warranty on the battery pack. I brought it into the dealership and they ran the routine computer diagnostics and said everything looks good. I fully expected them to tell me that the performance on the battery pack had fallen off, so I was a bit put out. The guy actually got a bit defensive with me when I asked him some further questions about what the criteria are for determining whether the battery back was performing as it is supposed to in order to get the maximum MPGs.
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I recently got my 2007 Prius back from the body shop after a 13k repair following a crash that crumpled my front end. The car seemed to be doing fine, until a long, steep climb had the battery drop to one bar, speed dropping to 40 despite a floored accelerator, and a red triangle that appeared briefly before disappearing just as we completed the climb. It's the dropping speed despite a floored accelerator and the warning light that have me worried.
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Today I went to the national car test (passed. but), when the car has been returned to me by the employee of national car test center I noticed one bar on the SOC. This happened for the first time.
Additional notes:
1) recently (about 4 weeks ago) I had to temporarily replace for second hand (20 bucks) 12v small auxiliary battery.
2) recently (withing last four weeks) I noticed high temperature in the boot compartment, I tried to investigate and the ducting leading from the HV battery was really hot, which means that my battery was really hot too.
I tried to explain this to myself that this might be due to HV operating at higher levels due to unknown state of the replaced 12v small aux battery (second hand product).
3) Today I noticed that technician at the test center used some spring assisted bar to press the brake on the car while he tested the car, I recon that maybe he have had powered off the car while doing so, is it possible that this might have contributed to the dropped SOC ?- it's just my guess.
I'm thinking to replace 12v aux battery to brand new battery and then test the operation of the fan and whether the temperature still rise. - is it good idea? Or should I just seek for the testing tool to determine the status of each of the modules?
If so, which testing device can handle this task? I heard from this forum about ELM obd bluetooth adapter. I use android device, would this be okay or should I look for another device perhaps scangauge?
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How to do the transaxle fluid change and finally did it myself. I dropped and clean the pan and put new gasket. The MPG dropped a little, I was getting 44.6 before fluid change and after fluid change it dropped to 43.3 ... Why this happened.
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