5th Apr 2007, 12:06

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.

2nd Aug 2007, 12:02

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.

3rd Aug 2007, 09:40

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.

27th Nov 2007, 19:15

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.

28th Nov 2007, 10:31

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.

13th Nov 2008, 11:45

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.

23rd Dec 2008, 08:19

I've owned a 99 & an 02 Deville & both vehicles would get over 25 mpg on the h-way.

28th Mar 2009, 03:15

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...

17th Nov 2010, 17:08

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.

18th Jan 2013, 19:16

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.

7th Feb 2013, 07:54

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.

23rd Jun 2013, 21:05

I have a 2005 DeVille, and on trips I average between 27.5 and 31 MPG, depending on the terrain.

I bought it used with 46k miles. Three years later I have just under 103k miles. No major problems... just the usual things that one needs to stay on top of like brakes, tires, battery, and fluid replacement at regular intervals.

24th Jun 2013, 10:42

"I set the cruise anywhere between 62 and 65 mph."

How do you do that? Driving that slowly on today's interstates can get you a ticket for blocking traffic!

24th Oct 2013, 06:02

I have a 2005 DeVille, and on trips I average 28/32 MPG depending on terrain, headwinds, how heavily the car is loaded, and speed (60/75 mph).

8th Feb 2014, 15:41

Since my twenties, I have always driven BMW 3 Series vehicles. Last year when my elderly mom died, I found her 2005 Deville with the Northstar engine only had 40,000 miles. Therefore, I thought I would be insane to sell a car with this low mileage. My only concerns were bad gas mileage and the reliability of an American car. When I drove the Deville on its first trip, it averaged 31 MPG on the highway and 28 MPG in highway and city driving combined, and it used REGULAR fuel. That mileage exceed my small BMW. The car hit 99,000 last week. The only money spend on the Deville has been routine maintenance and tires. The car rides like a cloud, and has much more power than my BMW.

9th Feb 2014, 12:06

It is sad how many people out there like you go into inferior foreign cars just because of false misconceptions. Honestly, the playing field is pretty even in terms of reliability today. In 1980 it was another story altogether, but times change. I just wish Detroit could still make a decent size car with distinctive good looks, instead of trying to copy Japan and Europe like they seem bent on.

3rd Oct 2014, 23:21

If anyone thinks the Caddy V8 gets better MPG than a Buick LeSabre, they're either a seller or very misinformed.