: Help 06dts Mpg

12-08-06, 11:45 PM
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.

12-08-06, 11:53 PM
FPR leaking. Unlikely on a new car but stranger things have happened. What kind of driving are you doing? City?

12-09-06, 08:42 AM
New guy and new Caddy :thumbsup:

I was going to say is the weather getting very cold where you live, but Ranger's answer seems so much more correct! :D

12-09-06, 07:50 PM
I was going to say the cooler weather, and peoples tendency to let their car idle more to warm up. I'm averaging 12.5 MPG with my '94 Deville now that it's cold and I let it idle a bit to warm up. And like your DTS I do get high 20's MPG on the highway easily, but not during the Winter.

12-09-06, 10:34 PM
^^ Plus the car runs "rich" for a longer peiod of time and the engine takes so much longer to fully warm up, so it is less efficient.

12-10-06, 02:46 PM
:hmm: Something's fishy....I've had my '02 STS for a year and 3 weeks. The day I bought it I reset the average mileage function and have not reset it since. With a combination of 60% highway/freeway and 40% local/city driving, I have averaged 22.3 mpg for a year, 8300 miles. Yes, the mpg goes down to 18-19 in a couple of weeks of slower driving, but crawls back up into the middle 23's during a 420 mile round trip to Norfolk, and that's using 87 octane 10% ethanol crap. (Back country road-running uses 93 octane from a non-emissions county...) We'll do a 1750-mile round trip to FL in 2 weeks, and I'll post what happens doing 85 on 95......A couple of friends own an '03 DTS, drive to FL twice a year, and average just over 26 mpg. Don't idle a modern engine with modern oils to "warm it up".......let the PCM fast idle drop to 900 or so, and then drive conservatively for 3 or 4 miles. Extended cold idling washes oil off the cylinder walls and actually leads to increased wear.

12-10-06, 09:59 PM
^^ Damn you get good MPG. My 95 Eldo struggles to get 14 MPG with premium. :(

But I don't do a lot of long trips with it.

12-14-06, 12:38 AM
Yah, i get between 24 and 26 doing 80 in the summer. I lose a couple MPG in the winter. I normally drive 80 to 85. This is a 2003 STS.

I use mostly mid-grade (87-89) and sometimes regular. I never use premium.

12-14-06, 09:50 PM
^^ Thanks...now I feel even worse! :crying:

12-15-06, 08:08 PM
Sorry dp102288 I use regular and I average 16 to 18mpg.

12-16-06, 05:05 AM
Normal city driving with a fair amount of highway each week ... I'm in los angeles, so no cold weather idle here, and the car is garaged...it's a mystery ... it's almost as bad as the 71 Impala I had way back when ...

12-16-06, 09:33 AM
Sorry dp102288 I use regular and I average 16 to 18mpg.

You put regular in your 96 (isn't that bad?) and still get 16-18?

Something must be wrong with the Eldo then...:(

Maybe I need to check my FPR...but the car starts great when hot. :confused: Will still check though.

12-16-06, 07:44 PM
The regular vs premium wars will rage on forever dp102288. Do a search on gas or regular vs premium and you will come up with some very good info.

12-16-06, 08:55 PM
^^ Will do thanks. If its anything like the oil wars I will be busy for days!

12-18-06, 02:04 AM
^^ Thanks...now I feel even worse! :crying:
Sorry, Bro. :(

12-18-06, 12:37 PM
^^ Nah don't be sorry...it just my Eldo is evil!