Another way to prevent getting this page in the future is to use Privacy Pass. My 2004 Prius quit (Danger warning lights) 2 miles after a fuel fill-up. July 4, 2016, 9:55pm #1. I haven't changed the spark plugs, do they have any effect on low mpg?

Right now I am seeing roughly 41 MPG and that is after changing the spark plugs with brand new NGK Iridium's, Air intake filter and did an oil change since it was due for one.

I realize that my memory could be faulty, but this is driving me nuts. He was "amused" when I told him I use the Walmart brand... Tech or something in the blue bottle. After sitting, it seems normal for a while after start-up but then tends to drop. Mine has never attained that and it has been steadily dropping. Also, it seemed the oil was somewhat "channeling" on the dipstick... hard to explain, but it wasn't 100% coating the dipstick like I'd normally expect and seemed like wouldn't "stick" to it.

Prius (2010-12) Fuel :: Mileage Dropping Without Any Apparent Reason. Were you going really fast when you got poor fuel economy?

It is new and has just under 500 miles on it, and I read that the break-in is 1000 miles. Two are grey and two are black, in alternating order. When the car is totally warm and I measure the mileage for 15 miles or so I get normal readings of mpg. The MPG on our Prius recently dropped from 52 to 44. I have driven the car roughly 2,500 miles since all of this stuff was done and it just seemed to continue to drop to the 41 MPG mark.What I have noticed though is that when the motor turns off it shudders and the when it restarts while the car is in park the car will roll back and forth slightly. Could that be caused by a bad coil? They said my MAF bank 1 sensor 1 needed replacing but they didn't have the part so couldn't do the fix but I'd be okay to complete my trip. So in the middle of a road trip 9 days ago my check engine light came on. The Tahoe has been running great and was getting normal mpg until recently. They were in there a little tight and the crunching noise they make at first is a little disconcerting, but I'm thinking it has something to do with the coating NGK puts on their plugs.Anyway, everything went smooth and I took my time and used tips I read about here. I have another 2010 I have been driving for 3 years so I am pretty used to the mileage I can expect under different conditions. That being said, shouldn't I be seeing better MPG than that?

The MPG on our Prius recently dropped from 52 to 44.

I was close to a Toyota dealer so I went there for a diagnosis. The last 3 fill ups my mpg has been below 13.5mpg. Because I have tried everything short of taking it to the dealer which I really do not want to do again and be told there is nothing wrong with it when I know there is. 27 Answers. Owner's manual says take it to the Toyota dealer. back got 41mph what should i do to get back the © 2020 CarGurus, Inc., All Rights Reserved. Now it is displays as 19 mpg. Gas mileage as stated by Suburu for the 2015 Outback (2.5 engine) is 25-33 with a combined of 28. The tranny repair guy told me that some oils contain unacceptable amounts of paraffin (a WAX)... told me to never use Quaker State and that he recommended Valvoline. Recently, my spark plugs were replaced and now my gas mileage has dropped to 24MPG.

I know the car is getting older, but where do you think I can get some of it back?

Prius sudden gas mileage drop. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. I have a 2004 Chevrolet Tahoe 2WD with the 5.3L V8. Most of my driving is short distance, stop & go, and I am seeing that sometimes the engine doesn't shut down when I am stopped. I checked the oil level at every stop and it was never more than 1/2 quart from full.

The drop occurred shortly after we took the car to a dealer for the software related recall fix. Dodge - Ram :: Oil Pressure Fluctuating - Slowly Dropping To The 1/4 Area Of Meter? Please refer to CarGurus Terms of Use. BTW - I am hoping that I am just not being fair (to the car and to Suburu) and that I'll be up in the advertised MPG's soon after I hit 1000 miles. They also told me that my spark plugs were shot. Prius (Gen 3) :: 2010 Mileage Is Dropping Than Usual I just bought a 2010 salvage Prius. Have had my 2011 Prius all of 4 weeks. Car still runs great but at 13mpg it's starting to hurt a little financially.

I could also swear that those OEM plugs always had 3 grounds. But your fuel mileage can easily drop 5 mpg (miles per gallon) or more before that happens so if your mileage has been dropping and you have 80,000 miles are more this is a good place to start.

I live in Raleigh, NC and I did notice a drop in drop in MPG over the winter ranging between 44-48mpg but the mpg never rose again as the months warmed and I averaged 44-46mpg for most of the summer. Alas I can't be sure what was there before versus what's there now, but I know my previous mechanic was a stickler for OEM parts.

Anyway, there wasn't any foaminess that would seem to indicate water in it... and I've never used any oil additives.What can cause reduction in oil pressure? • Tahoe has 134K. Weather over 100. 1995 RAM 2500 5.9L 2x4...I think the wire to my oil pressure gauge might be shorting or loose, since the needle sometimes swings from 0 to the middle unexpectedly for no apparent reason. However, during my recent 350 mile trip back from FL to North GA, I noticed that while "stable", the pressure seemed to be ever so slowly dropping to the 1/4 area of the meter. It has now 145K miles.when I bought it a year ago, it had 134K on it. Followed PC for months before the purchase, practice pulse/glide regularly and have really change driving habits to increase MPG. I hope to put them in in a day or 2. Followed PC for months before the purchase, practice pulse/glide regularly and have really change driving habits to increase MPG. my mileage is slowing dropping, i am thinking about installing new plugs.? I think in the end though we are going to be friends...Here are some pics of the old plugs.

Discussion Starter • #1 • Nov 19, 2007. Passat (B5) :: 2002 - Changed Spark Plugs But Gas Mileage Dropped To 24 MPG? Why the sudden drop in our 2012 Prius gas mileage?

It did seem somewhat "black" given that I changed it and filter about 1,200 miles ago. I have one other incident where when I was traveling at a low speed, I lost all power. Should I tighten the spark plugs to the same torque specifications as regular plugs? No other changes were made. I just bought a 2010 salvage Prius. Prius (2004-09) :: Spark Plugs Shot At 38,000 Miles, Prius (2004-09) :: Necessary To Disconnect 12v Battery Before Changing Spark Plugs, Prius (2004-09) :: Changed Spark Plugs But Gaps Were Little Out Of Range, Prius (2004-09) :: Hybrid Warning Light Came On When Replaced Spark Plugs, Prius (2004-09) Fuel :: 2006 Noticeable MPG Drop After Changing The Spark Plugs. How do I know I have tightened them to the right amount?How do I avoid cross threading the spark plugs? The dealer said I’d run it out of gas and the 12 volt battery was no longer good. How do I get to the spark plugs and what brand is recommended? What happens if you cross thread the spark plugs (assuming the car seems to be running fine)? I had a similar problem once with my previous car (1998 Jetta GLI) and it was due to going from a three ground spark plug to a single ground plug. What could be causing my mpg to drop by so much while the suv still rides smooth and straight? I was normally getting 49-51 mpg, suddenly my mileage dropped to around 40-42 mpg. Performance & security by Cloudflare, Please complete the security check to access.

I have noticed over the past few months that my gas mileage is dropping (from about 29 to 24) on the highway and I seem to have lost some power.

In the Phoenix area, temperatures rise in March and sometimes we will have a short period of warmer than normal temps in February. 15mpg in town and 17mpg on the road is what I normally get.

What are the signs that the battery may need replacement? Prius (Gen 3) Fuel :: Not Changing Spark Plugs Can Drop MPG? You may need to download version 2.0 now from the Chrome Web Store. I bought my 07 prius in May and got very good mileage. Worth a read ... According to the service rep, they looked like they were from a car with over 100,000 miles.Is this possible given the description above from the first time my check engine light came on? Is it the tires or is there some other possible issue? I was able to drive home 4 hours with the check engine light on but no further issues with the exception that I got less than 20 miles a gallon for the trip.Took my car to a local Toyota dealer.

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