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Cadillac STS Forum - 2005 through 2012 Discussion, Gas Mileage for 2005-2007 STS's, both RWD & AWD in Past Cadillac Vehicle Discussion; Originally Posted by Smiling Jack 2006 V6 RWD, brand new Michelin Pilots, original (staggered) wheel and tire sizes, negligible wind, ...
  1. #31
    Budabear's Avatar
    Budabear is offline Cadillac Owners Member
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    Re: Gas Mileage for 2005-2007 STS's, both RWD & AWD

    Quote Originally Posted by Smiling Jack View Post
    2006 V6 RWD, brand new Michelin Pilots, original (staggered) wheel and tire sizes, negligible wind, 83 F outside air, A/C on, extremely level terrain, all highway, frequent overpass humps, typically 60 - 65 mph, occasionally slower, light traffic, ~3/4 full of fuel.

    31.6 (per DIC)mpg on 10 mile trip to airport with only myself in the car.

    30.6 mpg on return trip with 2 added passengers plus luggage.


    Not bad, but not particularly impressive for the V6 considering that my '95 Seville STS N* V8 used to do about the same and was considerably quicker and also roomier.
    Definitely great mileage! I'm still torn between the V6 and V8 because both seem to do extremely well but the V8 has that punch. Lol

    ----------

    Quote Originally Posted by ghostdriver View Post
    I have a 2007 STS V8 4.6L. It's rated about 27 Highway / 17 City. I have a long commute but it's through stop-and-go traffic more often than not. It's also our family car so we drive it around town as well. I'm averaging about 18MPG according to the readout on the display.
    18 in the city is very good for a large car.

  2. #32
    02603sec's Avatar
    02603sec is offline Cadillac Owners Fanatic
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    Ive driven my 1sf 4.6 back and forth from philly to chicago a dozen times. 80 mph 2600 rpm passing everyone some faster then others. 22 mpg. Around northern Bucks 19.5. The dic is very accurate on fillups and miles in left in the tank. The latter is one of my favorite features. 9.5 hours my best eta. Absolutely would not buy a caddy with a 6. Will have to go back to BMW.

  3. #33
    EChas3's Avatar
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    Re: Gas Mileage for 2005-2007 STS's, both RWD & AWD

    Quote Originally Posted by ghostdriver View Post
    I have a 2007 STS V8 4.6L. It's rated about 27 Highway / 17 City. I have a long commute but it's through stop-and-go traffic more often than not. It's also our family car so we drive it around town as well. I'm averaging about 18MPG according to the readout on the display.
    I'd call that typical. City driving in a 2-ton car sucks gas. The N* breathes great above 2k RPM, but inhales gas.

  4. #34
    Budabear's Avatar
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    Re: Gas Mileage for 2005-2007 STS's, both RWD & AWD

    Quote Originally Posted by 02603sec View Post
    Ive driven my 1sf 4.6 back and forth from philly to chicago a dozen times. 80 mph 2600 rpm passing everyone some faster then others. 22 mpg. Around northern Bucks 19.5. The dic is very accurate on fillups and miles in left in the tank. The latter is one of my favorite features. 9.5 hours my best eta. Absolutely would not buy a caddy with a 6. Will have to go back to BMW.
    This sounds like why I got rid of my Seville STS. Using that much gas on the highway I'd never keep it. Unfortunately I do realize now it was my fault. I have a heavy foot and believe now that I would have gotten much better mileage if I had taken it closer to the speed limit. On long distance trips I'd take it as high as my pace car and quite often that was VERY HIGH.

  5. #35
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
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    Re: Gas Mileage for 2005-2007 STS's, both RWD & AWD

    Given the low relative cost of these cars, I'm not concerned about mileage. A $10,000 price differential to similarly equipped cars buys a lot of gas. (Keyless entry, ACC, HUD, etc.)

  6. #36
    Aurora5000's Avatar
    Aurora5000 is offline Cadillac Owners Fanatic
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    Re: Gas Mileage for 2005-2007 STS's, both RWD & AWD

    My 2006 STS Northstar averages 20 mpg mixed driving. Use regular 87 octane.

  7. #37
    turnne is offline Cadillac Owners Connoisseur
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    Re: Gas Mileage for 2005-2007 STS's, both RWD & AWD

    Quote Originally Posted by EChas3 View Post
    ^^^ If a few hundred bucks a year concerns you, don't buy a Cadillac, BMW, Mercedes, Jag, Audi, etc. Stay in your Toyota and enjoy.

    You gotta pay to play.
    LOL.....and here we go

    its really connected to the purchase price of the car as to what is "comfortable" or not

    I really doubt that there is more than 2-3 MPG difference in the v6 and the V8
    Unless you drive a LOT of miles the difference on an annual basis is going to be negligible

    Added to that you can use 87 Octane in a Cadillac....you will save more in the 20 cents per gallon over premium than the difference in the v6 and V8 MPG numbers


    Warren

    ----------

    Quote Originally Posted by EChas3 View Post
    Given the low relative cost of these cars, I'm not concerned about mileage. A $10,000 price differential to similarly equipped cars buys a lot of gas. (Keyless entry, ACC, HUD, etc.)
    I doubt the market thinks of it that way

    Lower cost car mean less desired spending on it...whether that be because of will of budget

    There is reason why these cars find the junkyard quicker than cars worth a lot more


    Warren

  8. #38
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    Re: Gas Mileage for 2005-2007 STS's, both RWD & AWD

    I've found the N* starts to produce its torque and mileage suffers above 2k RPM. That's where my wife's car cruises at 80MPH and can get 25MPG. At the same RPM, my car is going 62MPH.

    I might be getting even better mileage but I don't know. It's too slow!

  9. #39
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    Re: Gas Mileage for 2005-2007 STS's, both RWD & AWD

    Although our cars are 2008 models, I thought you might be interested in our results. The 2008 V6 STS AWD overall is currently 21.4, and has been as low as 20.8 over the winters. The 2008 V6 SRX AWD, with the same 3.6 (non DI) engine is consistently 19.5 summer and winter.
    The car we traded on the STS was a 2003 Seville STS w/N* and the overall was also 19.5. The driving is about 50-50 city vs. highway. The previous SRX was a 2006 and it also averaged 19.5.

  10. #40
    nwjones18 is offline Cadillac Owners Member
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    Re: Gas Mileage for 2005-2007 STS's, both RWD & AWD

    I get around 17 in town and 23 on the hwy with my 05 N* RWD.

  11. #41
    LINUXman is offline Cadillac Owners Member
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    Re: Gas Mileage for 2005-2007 STS's, both RWD & AWD

    Hi Budabear

    I don't know about the AWD, but my 2005 STS V6 3.8L RWD does average 25 Mpg, I usually do 50% town and 50% highway, and usually SOFT on the stop and goes in town, and I go just under the highway speed TOLERANCE so I don't get tickets (72mph)

    I've had weeks were I was in a hurry all week and was harder on the throttle but didn't noticed any changes on the gas flow, but I still was 50% town and 50% highway,

    When I purchased the car it use to belong to an old town cruising retiree, and when I first filled up the care, the computer indicated 250 miles of autonomy ? After a week I filled it up and it indicated 470 miles of autonomy, and if I would do 100% highway, I would probably get 30Mpg...

    So I think that town/highway makes the difference not the throttle (unless you drag race every one in town on every intersections ) or 100% stop and go in town...

  12. #42
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    Submariner409 is offline If it won't run, chrome it
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    Re: Gas Mileage for 2005-2007 STS's, both RWD & AWD

    Budabear has not posted in over 2 years, but he does check on the site once in a while.

  13. #43
    LINUXman is offline Cadillac Owners Member
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    Re: Gas Mileage for 2005-2007 STS's, both RWD & AWD

    Well he does show a minimum of interest, it's better than nothing at all

  14. #44
    mark@guitammer.com is offline Cadillac Owners Member
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    2010 3.6 v6 awd. About 18 -19 in town with a/c. Averaged 25 - 28 hwy on long interstate trip with cruise at 78. For s&g tried 89 octane and seemed to get about 1.6 mpg more on hwy which offset the extea .10 / gallon cost over regular. 20k miles on the 2010 (purchased this March )

  15. #45
    CadiTamer is offline Cadillac Owners Fanatic
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    Re: Gas Mileage for 2005-2007 STS's, both RWD & AWD

    2006 3.6 RWD. 100% city driving with a lot of stop and go and idle time and heavy acceleration gets me about 17MPG. Highway at 55 seems to be around 35 or 36, and Interstate at 75 is about 27. Interstate at 90 is about 18
    (Most of the roads and interstates around here have a lot of hills, so that may not be right if you live in a flat area)

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