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Discussion Starter #1
OK, Gearheads. I need some help figuring out what's going on with my '05 CC. For over four years now, I've been averaging 16-17 MPG, daily driving. In the last few weeks, it dropped to barely 14 MPG. Driving conditions and habits haven't changed. If anything, I'm using less right foot than before to see if that will bring the MPGs back up. Cleaned the air filter. Checked the pressure in the tires. Recent services included rear differential and an oil change. I switched to Pennzoil's High Mileage stuff. Could that be it? I'd appreciate your feedback. Thanks.
 

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That high mileage oil is 10/40 isn't it? That could be it. I'd also check for codes. Maybe a sleepy O2 sensor.
 

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Discussion Starter #4
Thanks for the feedback. I checked my service order; they used 10W30. Is the O2 sensor something fairly easy/inexpensive to replace? Any other suggestions?
 

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Try using the 5w30 that the manual calls for. I would imagine the 10w oil could drop you that 1-1.5 mpgs. For 15 bucks of oil, it would be an easy enough thing to help narrow it down. You dont even have to change the filter
 

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I'd guess something is different with the gas you are getting. They may have some water leakage in the holding tanks or have added more ethanol than you were getting before. There is one local gas station that I cannot fill up my motorcycle at. I fill it up with 93 but it pings like crazy and can hardly idle. Never had a problem with any other station.

5w to 10w shouldn't cause a 3mpg drop alone, that's pretty significant.
 

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I'd guess something is different with the gas you are getting. They may have some water leakage in the holding tanks or have added more ethanol than you were getting before. There is one local gas station that I cannot fill up my motorcycle at. I fill it up with 93 but it pings like crazy and can hardly idle. Never had a problem with any other station.

5w to 10w shouldn't cause a 3mpg drop alone, that's pretty significant.
Its the phucking ETHANOL!!! I'm about to do a thread on this! There is a Getty gas staion by my house that is selling gas with no ETHANOL!!! My MPG went up about what yours droped.

I have to finish this tank of gas, which should be by the weekend, and I'll do a little write up.
 

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Its the phucking ETHANOL!!! I'm about to do a thread on this! There is a Getty gas staion by my house that is selling gas with no ETHANOL!!! My MPG went up about what yours droped.

I have to finish this tank of gas, which should be by the weekend, and I'll do a little write up.
Yeah, I hate ethanol. The EPA is pushing to make the maximum ethanol concentration cap 15-20% instead of the 10% cap now. Do they want us all to have sub 10mpg? Idiots. Car companies are pushing back saying the engines can't handle that much and they won't be able to honor warranties.

Price stays the same, but we get worse MPG and end up at the pump more. More profit for the gas companies because they can dilute down their gasoline and sell 10+% more. Then farmers ride the corn wave all the way to the bank. What a brilliant business plan, sounds like a bunch of mutual back scratching to me.
 

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Adding to the list..
When was the last time you cleaned the MAF sensor?
 

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Discussion Starter #11
Thanks for the suggestions everyone. On some level, I guess I knew I should check the codes. But that usually ends up in a significant service bill. I hadn't thought about cleaning the MAF sensor. I'm off to Autozone.

Its the ETHANOL!!! I'm about to do a thread on this!
Jordo, I'd be interested in reading your thread on the ethanol issue. How do I find out if my local station is using it and how much? It's not like they post the contents of their gas, like a restaurant menu: 1 part petroleum, 2 parts lizard spit, and 1 part Peruvian Panther pee.
 

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Jordo, I'd be interested in reading your thread on the ethanol issue. How do I find out if my local station is using it and how much? It's not like they post the contents of their gas, like a restaurant menu: 1 part petroleum, 2 parts lizard spit, and 1 part Peruvian Panther pee.
I believe if it contains ethanol the gas station must display a "May contain up to 10% ethanol" disclaimer on the pump. I would assume "May ..." could mean some batches have it, some don't. Maybe some even have less than 10% (like if it gets diluted with non E-10 gas in the holding tanks). This would explain the inconsistent mpg; one week it may contain none, another week it's full E-10.
 

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Jake'sDaddy, howdy neighbor. I'm in Sac too. I have UpRev's Cipher software, I can check codes for you, clear them or do a 2 degree advance if you like. PM me.
 

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..Jordo, I'd be interested in reading your thread on the ethanol issue. How do I find out if my local station is using it and how much?..
^Cali. has had a winter blend gas and no 93 octane for >15 years...

I'm preety sure you don't put E85 in there..
 
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