Why Does GM's Entire Ecotec Family Get Such Low MPG, and The LS' So High?

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Thread: Why Does GM's Entire Ecotec Family Get Such Low MPG, and The LS' So High?

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    6.2 Liter LS3 V8 surferdude00711's Avatar
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    Why Does GM's Entire Ecotec Family Get Such Low MPG, and The LS' So High?

    Why is it that GM's entire ecotec family gets such low MPG, and the LS' so high? Compare:

    Cobalt coupe w/ 145hp: 25/34 (carsdirect.com)
    Civic coupe w/ 167hp: 32/37 (carsdirect.com)

    Cobalt sedan w/ 145HP: 24/32 (carsdirect.com)
    Corolla w/ 130HP: 32/41 (carsdirect.com)

    Acura RSX-S w/ 210HP: 23/31 (carsdirect.com)
    Cobalt SS S/C w/ 205HP: 20/29 (Oct. 05 R&T)
    Corvette w/ 400HP: 19/28 (Oct. 05 R&T)
    Corvette and Cobalt are CLOSE.
    Last edited by surferdude00711; 09-02-2005 at 08:06 PM.

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    2.8 Liter Turbocharged V6 silverado_13's Avatar
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    Re: Corvette and Cobalt SS Get Same MPG (How?)

    My guess would be cause the engine doesn't have to work so hard with more power. Imagine the economy if you put the 2.2 eco in the Vette. It would suck. You make a good point about those other 4 bangers. GM needs to increase it's milage to stay competitive.

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    327
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    Re: Corvette and Cobalt SS Get Same MPG (How?)

    Quote Originally Posted by surferdude00711
    Why is it that GM's entire ecotec family gets such low MPG, and the LS' so high? Compare:

    Cobalt coupe w/ 145hp: 25/34 (carsdirect.com)
    Civic coupe w/ 167hp: 32/37 (carsdirect.com)

    Cobalt sedan w/ 145HP: 24/32 (carsdirect.com)
    Corolla w/ 130HP: 32/41 (carsdirect.com)

    Acura RSX-S w/ 210HP: 23/31 (carsdirect.com)
    Cobalt SS S/C w/ 205HP: 20/29 (Oct. 05 R&T)
    Corvette w/ 400HP: 19/28 (Oct. 05 R&T)
    Corvette and Cobalt are CLOSE.
    Its all in the rear end gearing and the SUPER 4 speed trannys

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    6.2 Liter LS3 V8 surferdude00711's Avatar
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    Re: Corvette and Cobalt SS Get Same MPG (How?)

    Quote Originally Posted by silverado_13
    My guess would be cause the engine doesn't have to work so hard with more power. Imagine the economy if you put the 2.2 eco in the Vette. It would suck. You make a good point about those other 4 bangers. GM needs to increase it's milage to stay competitive.
    But higher power doesn't always mean higher mpg. Actually, it usually doesnt. Compare BMW 525, 530, and 550.

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    Re: Corvette and Cobalt SS Get Same MPG (How?)

    Quote Originally Posted by 327
    Its all in the rear end gearing and the SUPER 4 speed trannys
    Corolla and Civic use 4-speed autos too.

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    Re: Why Does GM's Entire Ecotec Family Get Such Low MPG, and The LS' So High?

    i kinda wondered that as well, my alero V6 gets about the same gas mileage as the ECOTEC. It's only 3 MPIG worse in the City and the same gas mileage on the highway.

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    Re: Why Does GM's Entire Ecotec Family Get Such Low MPG, and The LS' So High?

    well duh, V8s are better
    But seriously, I'm not sure those are realistic. Someone on this site got 38mpg in his Cobalt. Perhaps the EPA tests aren't accurate. Someone whos owns an ecotec should tell us their milage.
    Proud driver of a 1993 Jeep Grand Cherokee
    5.2 Magnum V8
    164,000 miles

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    Alex Villani: Staff Writer Premium Member BigAls87Z28's Avatar
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    Re: Why Does GM's Entire Ecotec Family Get Such Low MPG, and The LS' So High?

    Possible due to the fact that the Civic and Corolla engines both use VVT to gain power across a large band, and the 2.2 Ecotec does not have VVT. Ecotec is also much larger then its compact brothers.
    It would be great to have the VVT technology trickle down to the 2.2 Ecotec, and possible make a gas-sipping Cobalt with the 2.0 Ecotec.
    Also, Cobalt's gearing is a bit different then Civic's,a nd the cobalt is a tad heavier then the other cars I belive. All this equates to lower mpg.
    Alexander Villani
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    Re: Why Does GM's Entire Ecotec Family Get Such Low MPG, and The LS' So High?

    Highest in my Alero was 31.87 MPG (95% highway) (120 km/h).
    Lowest in my Alero was 25.31 MPG (Mixed)

    My average over 15,000 km is 28.38 MPG (Alero has 75,000 km now)

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    7.0 Liter LS7 V8 desmo9's Avatar
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    Re: Why Does GM's Entire Ecotec Family Get Such Low MPG, and The LS' So High?

    Big fallacy is that more cylinders and peak horsepower reduces mileage, and generally it does not. It takes a certain amount of energy to move an Alero at 65 mph down the highway at steady throttle. The same amount of gasoline yields that energy, whether pumped through 4 or 6 cylinders. So it comes down to efficiency. Some engines are a little more efficient than others, and sometimes, higher power engines have more combustion efficiency due to higher compression ratios, less friction, etc.

    You know how many people I've know that got 20 mpg in their V6 S10 or Ranger, so traded to a 4-cylinder S10 or Ranger, and still got 20 mpg?

    The higher-power engines *will* burn more energy, though if you accelerate harder. Accelerate a 4 cyl and 8 cyl at the same rate, and the energy needed (and fuel consumed) is about the same. Use the potential of the higher-power 8-cyl, though, and you can accelerate (and use more energy) than is possible in the 4-cyl. Hence, city figures for bigger engines are usually less. The weight of the engine/car also comes into play in the city figures, where on the highway, weight means little and aerodynamics are very critical.

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    6.2 Liter LS3 V8 surferdude00711's Avatar
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    Re: Why Does GM's Entire Ecotec Family Get Such Low MPG, and The LS' So High?

    So is it true that forced induction increases MPG?

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    Re: Why Does GM's Entire Ecotec Family Get Such Low MPG, and The LS' So High?

    why doesnt an ecotec get as good mpg as say a corollas VVTL-i, or a civics vtec?

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    Alex Villani: Staff Writer Premium Member BigAls87Z28's Avatar
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    Re: Why Does GM's Entire Ecotec Family Get Such Low MPG, and The LS' So High?

    No, if anything is brings it down.
    You are forcing more air, and in doing so, the engine needs more fuel.
    Alexander Villani
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    GMI Staff Member Premium Member Ming's Avatar
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    Re: Why Does GM's Entire Ecotec Family Get Such Low MPG, and The LS' So High?

    I've often wondered why the Acura NSX gets such poor mpg considering its horsepower deficit to the Corvette. It sure isn't aerodynamics.

    Corvette: 6.0L V8 400HP 18/28 mpg $51,535
    Acura NSX: 3.2L V6 290HP 17/24 mpg $89,000

    These specs are sig worthy, considering the way the "JDM tItE riDeZ" guys idolize the NSX.

    "Big fuel sucking V8s" ??? Not by the numbers.
    Last edited by Ming; 09-02-2005 at 10:29 PM.

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    Re: Why Does GM's Entire Ecotec Family Get Such Low MPG, and The LS' So High?

    Quote Originally Posted by surferdude00711
    So is it true that forced induction increases MPG?

    haha, In almost all cases, NO

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