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Cadillac STS Forum - 2005 through 2012 Discussion, Gas mileage in Past Cadillac Vehicle Discussion; My gas mileage is really, really bad! I maybe get 200 miles per tank. This V-6, 310 hp Dodge charger ...
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    maiahsdad's Avatar
    maiahsdad is offline Cadillac Owners Fanatic
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    Gas mileage

    My gas mileage is really, really bad! I maybe get 200 miles per tank. This V-6, 310 hp Dodge charger gave me about 340 miles per tank while using it as a rental, while getting my car fixed recently. And I was very hard on it as well. I drive my car pretty easy. I don't understand.

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    1BadCadSTS's Avatar
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    Comparing STS with Northtar V8 vs 2014 Charger with Pentastar V6

    Heavier vs Lighter

    2004 technology vs 2011 Technology

    17.5 gallon tank vs 19 gallon tank

    5/6 speed trans vs 8 speed trans

    Rear end gearing also a major factor.

    "Horsepower sells cars. Torque wins races." Carol Shelby.

    They may be close in horsepower (320 vs 310) but the torque goes hands down to the N* ( 315 vs 268 )

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    atlrus is offline Cadillac Owners Fanatic
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    Re: Gas mileage

    My STS hits the sweet spot at around 85-90mph, at that speed I get over 360 miles per tank. Much worse when driving 65-70mph, less than 300 miles per tank.

    Slightly over 200 miles per tank in city, regardless of driving style. (by "per tank" I mean about 15 gal)

    P.S. Let's not forget that it is also an AWD car.

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    Ludacrisvp's Avatar
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    I'm seeing about 200 miles per 15 gallons but now it's bitterly cold and I'm doing a lot more of city driving than highway.
    Really depends on where I'm driving and ambient temp.
    When it was summer and I was on the highway commuting I'd get about 240-250 on the same 15 gallons.

    Mine is 6spd AWD northstar as well.

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    Quote Originally Posted by atlrus
    My STS hits the sweet spot at around 85-90mph, at that speed I get over 360 miles per tank. Much worse when driving 65-70mph, less than 300 miles per tank.

    Slightly over 200 miles per tank in city, regardless of driving style. (by "per tank" I mean about 15 gal)

    P.S. Let's not forget that it is also an AWD car.
    I notice the same thing. With my 3.23 gears awd and only having the 5 speed around 80 mph I get much better mpg than 50-60.

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    I get great mileage at 67 (just under 2k rpm) any faster it drops like a rock. I've not been able to cruise in the 90 range due to excessive police activity so I'm not sure if it's mileage would get better in the higher speed range.

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    malatu's Avatar
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    Re: Gas mileage

    A "tank" isn't a standard unit of measurement so "miles per tank" really doesn't mean anything, particularly when comparing different makes of automobiles.

    What is your miles per gallon?



    Quote Originally Posted by maiahsdad View Post
    My gas mileage is really, really bad! I maybe get 200 miles per tank. This V-6, 310 hp Dodge charger gave me about 340 miles per tank while using it as a rental, while getting my car fixed recently. And I was very hard on it as well. I drive my car pretty easy. I don't understand.


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    Quote Originally Posted by Ludacrisvp View Post
    I get great mileage at 67 (just under 2k rpm) any faster it drops like a rock. I've not been able to cruise in the 90 range due to excessive police activity so I'm not sure if it's mileage would get better in the higher speed range.
    Why would your mileage get better in the 90 mph range (or at faster speeds)?
    ddgm likes this.

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    Re: Gas mileage

    On my 2wd, filled up today. 15.1 gallons. (fuel light came on as I pulled into Costco). 287 miles. partial hwy. 18.9 mpg. 35psi on tires. Trip computer says my average speed was 27.5. Easy driving. Few hard starts. I filled up with premium today, (3.83) just curious if it will run any different, or get better mpg. When I had my 96 SLS, If I didn't use premium, it would set off my engine light, and I could feel the difference using premium. V6 maybe not??

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    Quote Originally Posted by erichthecatt
    On my 2wd, filled up today. 15.1 gallons. (fuel light came on as I pulled into Costco). 287 miles. partial hwy. 18.9 mpg. 35psi on tires. Trip computer says my average speed was 27.5. Easy driving. Few hard starts. I filled up with premium today, (3.83) just curious if it will run any different, or get better mpg. When I had my 96 SLS, If I didn't use premium, it would set off my engine light, and I could feel the difference using premium. V6 maybe not??
    Waste on V6. No performance gains from running higher than 87 octane on the the V6. V8 n/a 91+ recommended. V8 s/c premium required.

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    Re: Gas mileage

    Quote Originally Posted by 1BadCadSTS View Post
    Waste on V6. No performance gains from running higher than 87 octane on the the V6. V8 n/a 91+ recommended. V8 s/c premium required.
    I agree BadCad, my 07 CTS v6 rwd had to have premium, got about 21mpg, I would lose 2-3 mpg on regular. When I got my new STS v6 awd I put in premium but saw about 18mpg, went by owners manual and put in regular, now I can top 20 mpg.

    My old 99 STS ran on mostly oil....

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    Re: Gas mileage

    Quote Originally Posted by malatu View Post
    Why would your mileage get better in the 90 mph range (or at faster speeds)?
    That is why I mentioned it.
    ||
    V
    Quote Originally Posted by atlrus View Post
    My STS hits the sweet spot at around 85-90mph, at that speed I get over 360 miles per tank. Much worse when driving 65-70mph, less than 300 miles per tank. P.S. Let's not forget that it is also an AWD car.

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    malatu's Avatar
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    Re: Gas mileage

    Ya lost me. I still get the impression that the suggestion was made that you get better gas mileage at higher speeds.

    Quote Originally Posted by Ludacrisvp View Post
    That is why I mentioned it.
    ||
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  14. #13
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    Re: Gas mileage

    Quote Originally Posted by malatu View Post
    Ya lost me. I still get the impression that the suggestion was made that you get better gas mileage at higher speeds.
    Altrus said he gets better mileage at 85-90MPH than when he is going 65-70MPH in his AWD STS.

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    Re: Gas mileage

    Ok, back on topic. Why would you think you could possibly get better gas mileage by going faster? It's always been my understanding that the faster you go the more energy (gasoline) consumed (as well as greater wind resistance).

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    CadiTamer is offline Cadillac Owners Fanatic
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    Re: Gas mileage

    In some vehicles, the extra efficiency gained by running the engine in a slightly higher RPM band outweighs the extra drag caused by the higher speed.

    My RWD V6 STS gets better gas mileage around 65 than it does at 45, just because at 45 it's barely into 5th gear, and needs so much fuel to keep from stalling.

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