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Old 05-15-2009, 08:47 AM   #1
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Will Gas Milage Improve Over Time?

I am just wondering, on the highway with me varying speeds to the movie theater the over night only got 20MPG.

In town getting like 13-15MPG. She just hit 500 miles this morning. I sure hope it picks up some, this is worse than I thought it would be.
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Old 05-15-2009, 08:50 AM   #2
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Well ... it's not bad considering that the ls3 gets ... was it 23 or 24 Hwy ?

anyway give it another 700 miles and a new oil change and you should see some better results
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Old 05-15-2009, 08:57 AM   #3
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I'd give it alteast few thousand miles.
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Old 05-15-2009, 10:38 AM   #4
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I am just wondering, on the highway with me varying speeds to the movie theater the over night only got 20MPG.

In town getting like 13-15MPG. She just hit 500 miles this morning. I sure hope it picks up some, this is worse than I thought it would be.
When I worked at Honda, those cars would get dead on to the rated MPG from day one. You might gain another MPG though, but I've never heard of gaining any MPG once broken in.

The highway MPG should pick up since varying speeds in OD will gulp down some gas, but I doubt the in-city will get better. Especially since we are already on summer blend gas. Winter blend will take another ~2 mpg.
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Old 05-15-2009, 10:41 AM   #5
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We have a Toyota Tacoma with a 4 cylinder that picked up approximately 3 mpg from new until now. It occurred within the first few thousand miles. This is a documented increase since all mileage is tracked for business.
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Old 05-15-2009, 10:42 AM   #6
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Varying speeds is bad for MPG, also hurts the AFM, what speeds are you varying from? AFM works best once the engine is warmed up also
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Old 05-15-2009, 10:45 AM   #7
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Old 05-15-2009, 11:16 AM   #8
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its a v8 quit bitching. be happy you get what you get for a 400+ horsepower motor, hell my 98 TA gets about 12 mpg and its only at 410 to the wheels...and its no where near as quiet or smooth a ride
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Old 05-15-2009, 11:19 AM   #9
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I can't believe you would buy an SS V8 and be worried about gas mileage.

Last edited by BLUEMARO; 05-15-2009 at 07:34 PM.
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Old 05-15-2009, 11:21 AM   #10
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its a v8 quit bitching. be happy you get what you get for a 400+ horsepower motor, hell my 98 TA gets about 12 mpg and its only at 410 to the wheels...and its no where near as quiet or smooth a ride
Easy....Pump the brakes a bit....it wasn't a "bitch"....probably just a concern since most are getting near the mid 20s MPG.
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Old 05-15-2009, 11:23 AM   #11
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I can't believe you would buy ab SS V8 and be worried about gas mileage.
If you dont think people who bought SS are worried about MGP, then why would GM put the L99 in the Auto, with AFM? They know MPG is on the majority of peoples minds now. They want people who were on the fence to come on over to the SS side. The MPGs are not that bad. I would guess they'll sell 50% more than they would if it only got 18hwy.
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Old 05-15-2009, 11:23 AM   #12
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It'll get better Scott ..... at least my 2001 SS did .. give it a few K ...

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Old 05-15-2009, 11:23 AM   #13
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I can't believe you all are giving him a hard time about questioning the MPG when it is advertised at 24 for the LS3 and 25 for the L99. I would be a little put off too if the sticker says 25 MPG and all I could muster was 20 regardless of what engine was involved. Something is not right or that engine is really tight right now.

Also, the LS3 was mentioned in the thread early on and then AFM which is only offered on the L99 so which is it. OP, which engine package did you get?
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Old 05-15-2009, 11:24 AM   #14
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I can't believe you would buy ab SS V8 and be worried about gas mileage.
Why not???? these are built to get decent fuel mileage ....read my last quote
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Old 05-15-2009, 11:24 AM   #15
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Old 05-15-2009, 11:26 AM   #16
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Originally Posted by CamaroHutch View Post
If you dont think people who bought SS are worried about MGP, then why would GM put the L99 in the Auto, with AFM? They know MPG is on the majority of peoples minds now. They want people who were on the fence to come on over to the SS side, because the MPG were not that bad. I would guess the'll sell 50% more than they would if it only got 18hwy.
AFM is offered on the Camaro to avoid the gas guzzler tax. With the auto transmission, the LS3 would only get 23 MPG (gas guzzler tax threshold) or below hence requring the tax. That's why AFM is offered which is also where the L99 came from. The LS3 with manual trans already gets 24 MPG so no guzzler tax.
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Old 05-15-2009, 11:27 AM   #17
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Quote:
Originally Posted by Edrock View Post
I can't believe you all are giving him a hard time about questioning the MPG when it is advertised at 24 for the LS3 and 25 for the L99. I would be a little put off too if the sticker says 25 MPG and all I could muster was 20 regardless of what engine was involved. Something is not right or that engine is really tight right now.

Also, the LS3 was mentioned in the thread early on and then AFM which is only offered on the L99 so which is it. OP, which engine package did you get?
Anyone knows what they advertise and real world are 2 different things. Not many drive the car they way it was tested.
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Old 05-15-2009, 11:30 AM   #18
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Anyone knows what they advertise and real world are 2 different things. Not many drive the car they way it was tested.
I agree. But it seems he should be getting a little closer to the 25 mark to me. I'm just saying his concerns/questions are not out in left field. I think they are legit IMO.
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Old 05-15-2009, 11:48 AM   #19
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Suck,Squeeze,Bang,and Blow.

Have your dealer check the fuel mixture settings. They may have come set a bit rich.

If your a wrencher, you can look at the plugs to confirm this, the darker the color of the plug, the richer that cylinder is running.

Alternatively, if you make her breathe better with a cold air intake, and belch better with a less restrictive exhaust, your mileage should improve.

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Old 05-15-2009, 01:29 PM   #20
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Again Scott .. give it a little time as well ... I think you'll be happy w/ the MPG increase you will see ..

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Old 05-15-2009, 01:41 PM   #21
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My truck seems to do better on some tanks than it does on others. It may be the gas you are putting in. I also notice that my AFM seems to be a little more aggressive in kicking in when the weather isn't so cold. Sometimes it rarely switches to 4 cylinder mode and other times it's in it for 75% of the drive. Just my 2 cents...
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Old 05-15-2009, 03:21 PM   #22
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My truck seems to do better on some tanks than it does on others. It may be the gas you are putting in. I also notice that my AFM seems to be a little more aggressive in kicking in when the weather isn't so cold. Sometimes it rarely switches to 4 cylinder mode and other times it's in it for 75% of the drive. Just my 2 cents...
I think the water temp has to be a certain level before it changes.. mine is the same way... I get about 3-5 more MPG when its warm out than I do when its cold
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Old 05-15-2009, 03:30 PM   #23
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Originally Posted by BLUEMARO View Post
Anyone knows what they advertise and real world are 2 different things. Not many drive the car they way it was tested.
i can get more than advertised in my car, i guess it's driving habits.
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Old 05-15-2009, 03:39 PM   #24
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Is there a way to tell when AFM is engaged?
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Old 05-15-2009, 03:40 PM   #25
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Is there a way to tell when AFM is engaged?
Massive loss of torque? lol
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