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Just bought an 05 DeVille DTS with 8800 miles. Drove it home about 500 miles and averaged 22.6 mpg. I know owners of 98 and 02 DeVilles that routinely get 28 mpg on the highway, so I was disappointed in my results.

What fuel economy are other DTS owners getting?

Is there anything I should have the Cadillac dealer check out? Any fuel economy secrets you can share?

Many thanks....my first Cadillac, and I love everything else about it.
 

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White Diamond '03 DHS (with DTS floor shift)
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The DTS due to its 3.71 final drive ratio will not get as good of mileage as the Deville or DHS with a 3.11 final drive. Your mileage sounds about right for a DTS.
 

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2005 DTS - Blue / Grey
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I have an 05 DTS and I avg. 22.1 mpg, I have put 22,000 mi. on my DTS since Jan. 3rd. and it doesn't differ more than a tenth +/-.
 

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03 DTS
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What RPM are you turning on the hightway, wonder between DTS & DHS. My DTS stock 245-55-17 runs 2250 at 70 mph & 2450 at 75 mph. what does your do??
 

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Wow, I was thinking about buying a 2003 DTS. Maybe now I should consider the DHS instead. So low 20's (at best) on the highway for the DTS, what does the DHS do? Does the difference in final drive matter for city mileage?
 

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White Diamond '03 DHS (with DTS floor shift)
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I am averaging 24. Mostly highway. When I drove it home from Texas, where I bought it last year I got 26 (I was running 75 - 80 most of the way). The final drive ratio will affect mileage in city or highway. The DTS's 3.71 will cause the engine to run at higher RPM at any given speed than the DHS's 3.11. As an example, I turn 1950 RPM at 70 MPH. I think the DTS will turn about 2400 if I remember correctly. It works the same in city driving, just lower numbers.
 
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