Got a new 06 DTS in late Sept. Started out with 16-17 MPG, lately it's 13 to 14. Same type of driving. Any explanation...on the blog I keep reading about people complaining about getting 21MPG! And I'm driving calmly, no leadfoot here.
We have the performance model and by the car computer MPG we are getting about 16 with carefull driving. I'm going to check it against the actual miles driven just to check the computer. I know the Performance model has a lower final drive ratio which helps with the pick up but I have to say we are a little disapointed also. Our Q45, V8 also, was always around 20MPG and that was not babying it! Well it is what it is, still like the car.
I tell you what helped my MPG and that was to put more air in the tires. I think the tag on the door recommends 32 or something like that and I ended up putting like 37 or 38 in my tires. If you don't want to go that extreme then try 35. I can tell a small difference in the ride but my MPG ratings are definetly better.
We have a 2006 DTS III. Our mileage is terrible. The most we get is 18.8 per gal. I've had it back to the dealership twice without much help. We have been driving Cadillacs for over 20 years and have never had one like this. If anyone gets an answer, please let us know.
I have an 06 performance model and I'm averaging 16.5 MPG mixed driving I realize the performance model has a lower final drive ratio to give it more pep but I thought I wpold get 20 MPH but that's not going to happen. Anyone remember what the EPA sticker mileage was supposed to be?
I drive in town, where there are traffic lights or stop signs every few blocks but not an unreasonable amount of idle time at each. I checked yesterday and was 100 miles into a full tank of 87 octane and the gauge said 18.1 average MPG. I have been routinely getting 16-17 in town and my Continentals are at about 30PSI. 3000 miles on this standard DTS. I get 25MPG on the interstate even at 75-80MPH. As an aside, I recall one really cold day (20 degrees was the high) some years ago I was traveling about 150 miles and I got significantly lower gas mileage on that trip than I had ever seen before. I remember it was like 10MPG versus the usual 15 or so MPG, on a conventionally aspirated (not fuel injected) Ford V8 back in the late 80's. Wonder if MPG on fuel injected Northstars can be impacted by low temperatures?
We are getting the line that since the specs are 17 mi/gal to 25 mi/gal and we are getting 18.8 avg, that meets the specs. It doesn't meet hwy mileage by a long shot. I am going to call Cadillac Customer Service. Do you think they will really be of help? Has anyone ever called? If so, what is your experience? I'm not holding my breath. I sure appreciate having a message board to ask about these kinds of things.
Fill up your gas tank in the early morning hours when the gasoline is cold and thus more compacted. You get more gasoline for your money than if you get it at high noon when the gas is hotter and thus more space between the molecules. (I know this is true because I read it in the press and we all know that reporters do not lie)