I agree. There's no way a bigger car with a 4.6L will get better mileage than a 3.8L. My parents traded their LeSabre for a Deville and actually get about the same mileage. This is probably the V8 does not rev up as high as a 6 cylinder does during acceleration.
True on the mileage. My '00 Impala LS grabs about 28 MPG as opposed to the De Ville DTS pulling in only 19-20 on the highway. The De Ville cannot pass a gas station without stopping, but hey, that is the price we all pay for V-8 power and 300 ponies under the hood.
My 2002 Deville gets 20 mpg in the city and 24-26 on the highway, depending upon the speed. Never got lower than 20 mph for the 80K miles we have owned it. Needless to say, I love the car.
I think that poor mileage in a Deville is the result of a lead foot. People drive a Deville, floor it all over the great green earth, then complain about getting 15mpg. I drive mine in a manner that respects the car, and others around me and I am constantly returning atleast 25mpg and on long highway trips, 28mpg. I don't believe the above review is phishy at all. You don't have to mash the gas as much in a V8, in order to get the same amount of power that a 3.8V6 would have to rev HIGH and HARD to put out. I personally love my Deville and am quite happy with it.
I have to agree. I have a 3.8 series II engine and I get only about 21-22mpg mixed city driving, but I know someone with a caddy with the northstar and their computer says it averages about 21-22 mpg and I sure they do more city driving than I do, but I'm only 19 and have a lead foot. But I can say that even if you drive the 3.8 hard you still get about 20 mpg.
My 2002 base model DeVille averages 28mpg. I drive 80% highway on my commute and the city portion has rolling hills. This same commute with our 2005 Ford Focus (2.0 liter 4 cylinder, automatic transmission) averages 29mpg.
I've owned a 99 & an 02 Deville & both vehicles would get over 25 mpg on the h-way.
The Deville for its size and power gets good gas millage... I average about 24 highway and 17 in the city... but the Buick could have been getting poor mileage if it hadn't been serviced for a full tune up...
I have a base Deville and average between 28 to 30 mpg on the highway. That's at about 60-62 mph on a 60 mile daily commute, all highway.
It is incorrect to assume a larger car with a more powerful engine will get less miles per gallon than a smaller car with a smaller engine. During the late 90's, we shopped DeVilles and they were rated at better highway MPG than the same year of V6 Honda Accord. Sometimes a car might weigh a little more, but if it has a larger engine, then that engine will not have to work as hard as another car with a much smaller engine. People need to check their facts before they comment.
Our 2006 Impala got 23 MPG in highway driving. My grandmother's 1998 DeVille got consistent 29-30 MPG on the highway.
I bought my 2005 DeVille 3 years ago in 2010 with 46,000 miles on it. The odometer just turned 98,000 miles this week. No work other than oil changes had ever been done to it before I bought it.
I have just last year replaced tires, battery and complete brake job and shocks all around... just routine replacement stuff.
I consistently get between 29 and 32 MPG on the interstates, depending on how level or hilly the terrain is. I set the cruise anywhere between 62 and 65 mph.
It's a great car.
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