2009 Cayman S - Poor gas mileage SoundMaster - 9 years ago |
Re: 2009 Cayman S - Poor gas mileage MarcW - 9 years ago |
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SoundMaster
Hi..
I usually average about 220-240 miles on about 12-13 gallons of gas (18-19) which is kind of low to begin with. That's a mix of highway and city. Recently I had the dealer do an oil change, new spark plugs and an air filter. Since then I have noticed I am getting about 4-5 mpg less. I took it back to the dealer and they didn't find any fault codes. Even if I drove only city at 18mpg x 13 gallons = 234 miles..
The car does have a history of a faulty oil separator. The dealer replaced that a while back under warranty. At that time they didn't replace anything else other than the separator.
Any ideas? I thought it could be something like the MAF sensor...but surely the car would throw some codes if it was bad?
Re: 2009 Cayman S - Poor gas mileage SoundMaster - 9 years ago |
Re: 2009 Cayman S - Poor gas mileage MarcW - 9 years ago |
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SoundMaster
Thank you for the reply.
I realize the amount filled up can vary, so I go by gallons filled based on the fuel gauge level. If the light comes on, then assuming about 3 gallons left...I figure I should be filling up at least 13 gallons. I don't really go by the auto shut off since it turns off prematurely most of the time. If I fill up between 1/4 tank left and the before the light coming on, I do about 12-13 gallons. I try not to overfill.
Tire pressure and alignment is good.
I think the key to this is whether it is consistently lower for many fill ups... grant - 9 years ago |
I track my mileage and note mikefocke, '01S Sanford, NC - 9 years ago |
Re: I track my mileage and note SoundMaster - 9 years ago |
Re: 2009 Cayman S - Poor gas mileage Guenter in Ontario - 9 years ago |
Re: 2009 Cayman S - Poor gas mileage SoundMaster - 9 years ago |
Re: 2009 Cayman S - Poor gas mileage Guenter in Ontario - 9 years ago |
Re: 2009 Cayman S - Poor gas mileage SoundMaster - 9 years ago |
Re: 2009 Cayman S - Poor gas mileage MarcW - 9 years ago |
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SoundMaster
PDK. I am in Houston, TX.
It definitely is a noticeable difference in mileage. I am guessing it's the new spark plugs that are causing the issue...considering it started after the dealer changed.
What's funny is when I took it back there, I probably waited about 30 mins at the most..guy comes out and goes "nope everything looks good, spark plugs look fine..". Huh? You looked at the spark plugs in 30 mins..but you charged me for 2.5 hours of labor 2 weeks prior when I had you put new ones in?
Luckily I found a good indy mechanic. I guess I will take it there but I was hoping to have something specific they can look for...other than redoing the spark plug job.
Re: 2009 Cayman S - Poor gas mileage SoundMaster - 9 years ago |
Thanks to Grant's post I searched again... MarcW - 9 years ago |
Re: no luck at the indy shop SoundMaster - 9 years ago |
This is a long shot ... Pedro (Odessa, FL) - 9 years ago |
Re: This is a long shot ... Gary in SoFL - 9 years ago |
Re: You promised not to tell ... Pedro (Odessa, FL) - 9 years ago |
Re: You promised not to tell ... Gary in SoFL - 9 years ago |
Re: You promised not to tell ... Guenter in Ontario - 9 years ago |
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Gary in SoFL
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Pedro (Weston, FL)
Gary your story involved an abandoned Snap-On screwdriver which I still use to this day!
BUT.....it didn't reduce my mileage at all, not that I keep records on that.
Re: You promised not to tell ... Gary in SoFL - 9 years ago |
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Guenter in Ontario
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Gary in SoFL
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Pedro (Weston, FL)
Gary your story involved an abandoned Snap-On screwdriver which I still use to this day!
BUT.....it didn't reduce my mileage at all, not that I keep records on that.
Gary, did you find that your acceleration after the removal of that tool was not quite as snappy?
Re: 2009 Cayman S - Poor gas mileage grant - 9 years ago |
The slightest bit of suburban-semirural driving and my 981S's mileage gets clobbered. Laz - 9 years ago |
Are you ... Pedro (Odessa, FL) - 9 years ago |
Re: Are you ... SoundMaster - 9 years ago |
Stupid question, but I have to ask.. Rick (Nashville, TN) - 9 years ago |
Ok. Dropping from around 18.5mpg to you said in your first post 4 to 5 mpg thus.. MarcW - 9 years ago |
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SoundMaster
Both reputable shops. Neither of them can think of any reasons off top of their head and said there's really not anything they can do. Rennsport in Sealy, TX and Swiss Garage in Houston.
I don't have the experience to take stuff apart for diagnosis purposes and I am afraid I will do more harm than good. I can always buy the durametric software and get any readings off that..but not sure if it will show anything...
I am mainly concerned with the performance and longevity of components than cost savings. The money I can potentially save on gas will just get negated by the amount I will have to spend to diagnosis this.