Lexus RX 2004-09 :: Sudden Drop In MPG On 2007 RX350
I have a 2007 RX350, now at 110K miles, bought at 80K miles. I recently notice a sudden drop in mpg about 5K miles back (it might happen before that but I did not notice). Previously, the car gets around 25MPG on average, now it can only get 21 - 21.5 mpg, my range of a full tank drops around 60 miles. My route of driving everyday is pretty much the same. I have tried to change gas branch, using fuel system cleaner (Chevron Techron), check tire pressure but no luck.
What might be happening with the car that makes this significant drop in mpg?
I changed power steering rack and pinion at a dealer also about 5k miles back and at that point I had a dispute with a service consultant there. He made me drive back and forth a couple times without telling me that the part hadn't arrived yet (the car was on extended warranty). I then emailed directly to his boss. After that he treated me really well: gave me a most recent model loaner car for a week and did not charge for gas, and waived the deductible. Now I notice the MPG drop so I kind of link with this event and put him in doubt . Well, I'm not sure if he could do anything to the car since he's not the technician but still ... Can a guy put something to a car to reduce its fuel efficiency?
Prius (2004-09) :: 2005 - Cause Of Sudden Drop In Gas Mileage?
My '05 Prius has been going strong with just passing the 200k mark recently. However about 2-3 weeks ago after I replaced the PCV valve, I started getting really bad gas mileage. I'm talking about getting an average of 45 mpg in city/highway combo down to 30 mpg. Filled up my tank twice from empty so I'm pretty sure it's not just bad gas. Highway driving does slightly better than city.
Today I noticed that my acceleration from stop is just absolutely terrible. The car responds really slow and sluggish and takes a while for it to realize I want to go. Low speed doesn't get good mileage at all. It seems I get normal mileage at almost 65 mph, not sure why.
I don't think the 100 degree weather we are having here in Texas is causing THAT much of an effect because last year and two years ago during 100 degrees, gas mileage was normal. What to check? I searched and most talk about cold weather. I have a relatively new 12V gel battery so I doubt it is that but I can try disconnecting it.
Prius (2004-09) Fuel :: 2008 - Sudden Drop In Fuel Economy - Water Leak?
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).
View 4 RepliesPrius (Gen 3) Fuel :: Sudden MPG Drop From 54 To 41
So yesterday, I reset my trip meter when I put on gas. I did a 7 mile drive home (no highways) MPG was around 54. This morning, my husband pulls the car from the garage to the driveway to install my name plates. When I start the car, I noticed MPG was 41. What could have caused the sudden overnight shift from 54 to 41. I only drove 3 miles to work since then so it is hovering around 42. Could the cold morning start to back up from garage did something? Could he have left the power switch on (and it shut off automatically).
View 6 RepliesSubaru - Forester :: 2004 - Gas Mileage Sudden Drop
I have a 2004 Subaru Forrester with a 2.5L engine (non-turbo) and about 137,000 miles. I usually get just a bit more than 300 miles on a tank of gas. About 3 weeks ago, I took the car for a major tune up (and they also replaced a valve cover around the spark plugs area). After the tune up, the car was running great and I was still getting about 300 miles to the tank. Within the last 10 days, I noticed that the gas mileage on the car has decreased - I am now getting closer to 250 miles per tank. The mechanic rechecked the fuel lines and test drove the car two days ago but did not see any signs of leaks. The weather was near freezing for about a week but has warmed up again to the 40's. My driving habits have not changed and I am driving the car the same way as before. I am stumped as to why the gas mileage would drop that much. What might be happening?
View 8 RepliesPrius (2010-12) Fuel :: Sudden Drop In Gas Mileage
I commuted to LA 2-3x a week. The mileage on my car is now at 90k. I have had an average of 40 mpg since new, but suddenly it began to drop. We took it to our local Toyota dealer and was told it was most likely a cable that needed to be cleaned. That was $160. It didn't work.
View 10 RepliesPrius Plug-in 2012-15 :: EV Mileage Sudden Drop
I was driving up a hill today at about 30 mph with .9 miles remaining showing on my EV battery meter when all of a sudden it drops to 0 EV miles remaining and shows only 2 of the battery level bars (which is very very low), and the engine of course turns on. What happened?
I promise I did not push the EV power bar over its threshold. I monitor that like a hawk. I also know for a fact that it jumped from .9 to 0, because I watch that part like a hawk. This part of the trip is near the end of my drive home and I've done it about 50 times so far with no issues. With .9 miles left at that point on the hill I have always been able to make it to my driveway with .4 or .5 remaining, so this is very odd.
Prius (2010-12) Fuel :: Sudden Drop In Mileage
I am using a 2012 Prius and I was running around 23KMpL average. For sometime I am seeing my mileage around 17 - 18 KMpL. What could be the reasons for this ?
The only change happened in between is that I had a accident which I had to replace the front buffer.
Prius (2010-12) Fuel :: Crazy Noise Plus Sudden Drop In MPGs
First time Prius owner Aug 2012. First 2 tanks of gas very impressed at 50-51 mpg. Then going slowly (10mph) through a parking lot I heard a strange noise on passenger side underneath the car. The best description is that it sounded like a steel lawn rake being dragged under the car on the asphalt. It lasted for about 30 seconds, then quiet and I have not heard it since. No sign of issues. No dash warning lights.
My next tanks rendered 47.5, 48.5, 46.5, 45.75 mpg. Then in the last 2 tanks suddenly at 41.5 and 42.75 mpg. This seems like a very major drop in mpg. I have been reading the comments regarding outside temp etc. and I will make adjustments. It just seems extreme and the "noise" is now making me wonder if some electrical component failed and is adding to the poor mileage issue.
Prius (2004-09) :: 2007 - Right Rear Tail Light Keeps Burning Out / Sudden Acceleration?
We have a 2007 Prius and have been very happy with it overall. The right rear tail light keeps burning out and we keep taking it back to the local Toyota dealer for replacement, but they have been very good about it. Though an annoyance, if that was the only problem we had I would not be here right now typing this.
Today my wife was driving and came to an intersection at a red light to make a right-hand turn. She braked coming into the turn and as she made the turn. What happened next scared her and is very concerning to us -
Prius (2004-09) :: 2007 - Sudden Noise When Driving / Black Plastic Piece Touching The Ground
Today when I am driving the 2007 Prius, suddenly heard some noise. I managed to come home and checked. There is a black plastic piece hanging and touch the ground, the noise was from this black plastic piece touching the ground. Attached is the picture.Is this a big problem? Can I continue to drive the car to repair shop to get this fixed?
View 6 RepliesTiguan :: 2012 - Sudden Drop In MPG
Our 2012 Tiguan (FWD) has been experiencing a sudden drop in MPG for the past two weeks. We had no significant change in climate or driving habits. With mixed driving, we dropped from about 24 MPG to 20 MPG. We had our 40K service done just two weeks ago.
View 9 RepliesPassat (B6) :: Sudden Drop In Gas Mileage?
I have an 08 2.0T and it just suddenly had a huge drop in gas mileage. I recently had new tires put on and an oil change (about 35k miles). getting closer to 40k miles now and wondering what could be causing this. Usually I get about 30-33 mpg easy on the highway. Now I'm getting 24-26 mpg. Already checked the tire pressures. they're to spec. no gas leaks from what i can see.
View 6 RepliesSanta FE SM (2001-06) :: 2003 - Sudden Drop In Gas Mileage
My 03 (129k miles, 2.7 AWD) is up to date on all maint (this summer saw new timing belt etc., transmission service) and oil is current. Spark plugs are due at 131k. Air filter is new, tire pressure maintained at 30-32psi.
MPG has consistently been ~20, slightly more on trips. October 27 to November 26 was 19.8 mpg. Putting on brand new snows (General Altimax Arctic) knocked it down to 17.5 mpg for the next ~250 miles. However, since early December it's dropped again to 13 mpg!
Mechanic just checked for brake drag (none - rotating one wheel turns all 3 others easily); no pulling, rolls well in Neutral. No engine symptoms (missing, bucking) or CEL lights. Power seems a little diminished (for instance, it takes longer to shift during acceleration sequence).
I will add my Lucas Oil gas treatment just in case it may be injectors. My mechanic says he has seen MPG suffer from certain gas brands (and I do wonder if the tank fillup after which the MPG dropped had something to do with it).
Hyundai - Elantra :: 2012 - Sudden Drop In Gas Mileage
Why all of a sudden the mileage indicator on my 2012 suddenly dropped about 5 miles/gallon, both highway and around town? The car has only 9000 miles on it. Has there been a service bulletin regarding the "Eco'" mode? Having the "Eco" mode on or off doesn't seem to make a difference.
View 8 RepliesToyota - Corolla :: Sudden MPG Drop From 35 To 18 - 20 Miles Per Gallon
My 2000 corolla has consistently gotten 35 MPG until last month, suddenly I've dropped to 18-20 miles per gallon, a friend suggested fuel filter fail, but i can't discern if it has an external one...
View 11 RepliesRam / SRT10 :: Sudden Loss Of RPM / Drop To Zero Then Back To Normal After 5 Seconds
I was driving at 60mph and all of sudden rpm drop to zero went back to normal rpm after 5 seconds, pulled over thinking I blew some thing every thing seem normal is this a sensor problem.
2000 dodge ram 1500 5.9l 2wd
Elantra XD (2001-06) :: Sudden Drop In Mileage And Hard Shifting
All of a sudden my fuel consumption dropped from 28mpg as read from the computer display in the dash, to 21mpg. This was not a gradual drop, it was at 28mpg one day and 21mpg the next day. There is no service light on, do these cars produce codes that don't trigger the service light?
A few months ago the vehicle was getting stuck in various gears and lunging, this was from battery corrosion dripping down and eating away at the transaxle range sensor. I cleaned up the battery and replaced the range sensor and the vehicle was driveable again. It re-learned the shift timing and seemed to be ok, then about a month ago it seemed to be forgetting the learned shift positions after sitting over night, I replaced the battery, thinking it was in a marginal state where it would forget the program while sitting. The shifting is still hard sometimes but this seems to have worked but, now my mileage is horrible.
I thought I'd just change out the oxygen and air flow sensors but, then looked at how much they cost now, and realized this would be some costly trial and error. Is there a methodical way to troubleshoot this issue, any way to pull the sensors and measure them?
Sonata I45 (YF - 2011+) :: Front End Noise When There Is Sudden Incline Or Drop
I've got a noise in the front end of my GLS (52K miles). It's kind of hard to make it happen, but I hear it 2-3 times a day. It doesn't usually happen hitting a bump, but is usually heard when the weight of the vehicle shifts, when there's a sudden incline or drop, like when pulling into a driveway or gas station.
I had a car with a motor mount issue once, which sounded similar. However, I actually had my motor swapped 5K ago, and my noise existed before that.
I have to get to the dealer (I believe 60K is the end of coverage for this kind of thing). I would like to have a little more info or suggestion of what to check, otherwise it will be "we don't hear anything."