took the new DTS out on a 500 mile trip this weekend, its the first trip with the car and we managed to get almost 26 MPG going through the california sierra nevada hills. pretty impressive performance, i was stunned.

 

that is not a rare thing on most all GM's of the 80's and up, running and maintained properly, and drive at moderate speeds.

I get around that on all my passenger V8 cars, including the MK VII with a 5.0 crusing at 70 mph.
Pump the tires up to 36 psi and run her on "cruise control" .. then report back.

Not applicable to the muscle cars or the 6,000 lb 4x4 .. I'm lucky to get 12 - 14 mph on those, using crusie control .. .. 10 mph more like it, all around in city driving.




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My '07 DTS gets 25-28 on the highway here in Wyoming, at 6,000 plus feet. I tried it at 65 and at 75, the milage doesn't seem to vary by more than 1mpg! Dont think I'll be taking my wife's colbalt on any long trips just to save 5mpg!!

 

Hi Guys.
That mileage is very good for hills and mountains!
What kind of gas are you guys running, Premium or regular, and how many miles do you have on the car?

Southern