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2009 CTS

231 messages,  Last post on Nov 23, 2009 at 1:06 PM

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#157 of 231 Re: any update? [blackcadillac] by cdnpinhead Mar 10, 2009 (5:55 am)
Replying to: blackcadillac (Mar 10, 2009 5:35 am) I tried the 60 mph test. The average mpg did say 18 to 21 mpg traveling at aprx 60 mph on a flat road.   Winter is really hard on gas mileage, mostly because engines rarely get a chance to warm up (and that means the oil, not the coolant) completely. I drove a car in Alberta for awhile that had an oil temperature gauge, and it can take an hour or more to get the oil to a stable temperature when it's cold out, and even at that, the oil temp is lower than when the air temp is higher, as in the summer. Add to that the fact that "winter-blend" fuels rarely do anything positive for MPG.   I've done a fair amount of long-distance driving out here in the wide-open west and watching the average MPG number continue to go up for an hour or two on long flat stretches in Nevada, has be convinced that getting too worked up over poor gas mileage in the winter where it gets really cold is not a good plan.   See what happens next summer on a long trip.
#158 of 231 Re: any update? [blackcadillac] by ctsguy2 Mar 10, 2009 (5:56 am)
Replying to: blackcadillac (Mar 10, 2009 5:35 am) Hey Waffleman, I live on the Cape so we have similar weather and it sounds like similar cars too, though mine is AWD. I'm also disappointed with the gas mileage I've gotten so far, but am trying to follow previous advice on here and trying to enjoy the car while accumulating more break-in miles. Hopefully the mileage will increase over time, if not I'm thinking more and more of calling it a loss and checking out a VW CC.
#159 of 231 Re: any update? [blackcadillac] by pao Mar 10, 2009 (4:40 pm)
Replying to: blackcadillac (Mar 10, 2009 5:35 am) I also beleive regional refinery mixes of gas for winter blend also impacts mileage....wait till they switch to summer blends....last I check..there are 17 different blends of gasoline (not octane) that are blended in this country based on regions and EPA and state requirements
#160 of 231 Re: any update? [blackcadillac] by artmbgolf Mar 13, 2009 (9:57 am)
Replying to: blackcadillac (Mar 10, 2009 5:35 am) You said you did the 60mph test and talked about Avg MPG. I wanted you to also look at the Instant MPG display, while driving at steady MPH on a flat road, even using the cruise. There is nothing magic about 60, so you can go 65 or 70 also. The "instant" under those conditions, will give you a feel for what your best MPG could be.     I have had 4 Eldorados and 2 CTSs and all got the EPA MPG with this Instant MPG test and they all would show 60-70 MPG after taking foot off the gas and coasting. More miles, summer gas, etc, will help, but it sounds like you are so far below the highway EPA, that something is wrong. After this test, you have some facts to discuss with the dealer. Talking with the dealer about average MPG and city MPG, isn't going to get much done.     You could have something weird, like a brake rubbing, especially if it doesn't get good MPG on instant when coasting. Check your tire pressure. Replies to this message: blackcadillac (Mar 15, 2009 6:57 pm) artmbgolf (Mar 15, 2009 8:45 pm) temj12 (Mar 16, 2009 9:05 am) srushing (Mar 16, 2009 9:15 am) blackcadillac (Mar 17, 2009 8:24 am)
#161 of 231 Re: any update? [blackcadillac] by temj12 Mar 13, 2009 (10:46 am)
Replying to: blackcadillac (Mar 10, 2009 5:35 am) There are two things that come to mind. Are you using a gas/ethonol mix? Ethonol mix cuts your mileage and your power. When it says 10% ehtonol mix on the pump, I just keep driving. You can tell the difference in power. Also, you have a 6 speed transmission which may not be as efficient in stop and go. This is the first 6 speed automatic that I have had and I notice the difference in changes. I am not sure I like it better than the 5 speed auto '05 CTS that I had because it seems to hunt more for the right gear.
#162 of 231 Re: any update? [artmbgolf] by blackcadillac Mar 15, 2009 (6:57 pm)
Replying to: artmbgolf (Mar 13, 2009 9:57 am) OK, I did actually use the Instant MPG and it read 18 to 21 driving at 60MPH. And,.. yes going down hill coasting it would shoot up to 70MPG on the instant read out.   Tire pressure seems in line.   I'm still getting the same mpg. Nothing I do seems to change. If I drive as conservative as possible, the best is 13 MPG. If I get on it and use the sport mode, I'm looking at 10 or 11 MPG.   I'm going to take this baby back to the dealer again. I have notice other post regarding rough idle. I also have the same issue. For a 40k plus car, I am shocked how this thing sounds. I forget about it right up until I get out of the car while it's running. It always makes me double take and think something is wrong. I don't mean to whine..... I think the car is sharp and like a lot of the internal features, but I'm beginning to think I should have done more research before buying.   I'll also try to find a gas station that isn't 10% ethonol. I haven't been paying attention to that.   Thanks for all the comments and suggestions.   best, -s Replies to this message: artmbgolf (Mar 15, 2009 8:45 pm) temj12 (Mar 16, 2009 9:05 am) srushing (Mar 16, 2009 9:15 am) blackcadillac (Mar 17, 2009 8:24 am)
#163 of 231 Re: any update? [blackcadillac] by artmbgolf Mar 15, 2009 (8:45 pm)
Replying to: blackcadillac (Mar 15, 2009 6:57 pm) The 18-21 mpg Instant is a clue to report to the service. I don't know if you have the DI engine, but some have reported rougher idle. Does your car perform/accelerate like other 08/09's?   It does sound like something is not right with your car. Plenty of others have reported expected EPA MPG. Stop and go driving can be bad, but highway cruise should be better than you are getting.   Sport mode would hurt gas mileage.
#164 of 231 Re: any update? [blackcadillac] by temj12 Mar 16, 2009 (9:05 am)
Replying to: blackcadillac (Mar 15, 2009 6:57 pm) Something is definitely wrong with your car with that kind of mileage. I have the 3.6 base engine and mine shows 19.8 in a lot of stop and go driving. If I were you, I would be very upset with that mileage. Is this what others are getting with the DI engine? I never buy a gm product in the first year of model production. They never have it right. This is the 2nd year of that model and I would think that they would have it right by now. I think they are going to be resistant to you in terms of really looking into this, but I would keep after them. They are going to think that it has something to do with where you are driving or your driving style. Obviously, that is not the case. You have the more expensive CTS and I have the base and I am getting that much better mileage; something is definitely wrong. I am very sorry that you are having to deal with this; it is very upsetting. Replies to this message: srushing (Mar 16, 2009 9:15 am) blackcadillac (Mar 17, 2009 8:24 am)
#165 of 231 Re: any update? [temj12] by srushing Mar 16, 2009 (9:15 am)
Replying to: temj12 (Mar 16, 2009 9:05 am) Yeah, I think something's wrong too. I just completed a trip from NC to Tampa Fl and got an average of 25.1 MPG (calculated by hand) on the highway. And my 2009 still have less than 3000 miles on it, base engine.
#166 of 231 Re: any update? [blackcadillac] by pao Mar 16, 2009 (11:10 am)
Replying to: blackcadillac (Mar 10, 2009 5:35 am) ask the dealership to check the timing chain...there have been some instances in the 08 model of the the timing belt/chain stretching slightly.....and causing loss of power and MPG......noted this on another cadillac forum.....it should be covered under warranty

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