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I've driven my car in Eco mode for a week, and Sport mode for a week each. I seem to get the same gas mileage for both. The only difference is that the car doesn't sound as cool on Eco mode. What does Eco mode do?
 

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I am interested in that also. Of course I turned off my sound management system in settings, so it sounds great in any driving mode.
 
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I use the Eco mode most of the time, and turned off sound management like tnharley did. The only time sound is reduced is when it kicks down to 4 cylinder. I actually like that, because when cruising at a higher steady speed, the exhaust does not drone non-stop to give me a headache. I always ride top down. Have not made a scientific comparison of mileage by mode.
 

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Many have reported back that ECO mode does not give them their best mileage. Some have said that it does. Let's ask this question, would GM have invested tens (or hundreds) of millions of dollars, to create the complex AFM four-cylinder mode, if it did not result in better mileage?

GM is also not the only company to develop an ECO mode, though they all call it something different; in fact almost every car company with a V8 has an ECO mode
 

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Ariel, make the change from the center screen. You can't change it from the dashboard 'settings'.
 

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I find it interesting that Range Technology, which sells the AFM Disable OBD2 device discussed on this site (and is used by Norm) also sells an "AFM Extend" plug in device that causes the engine to remain in 4 cylinder mode to a greater extent than normal.

The theory is that under light loads, an engine is more efficient generating the demanded power with 4 cylinders, heavier loaded, than 8 cylinders, lightly loaded. I intend to disable the AFM, not because of mileage issues, but because I am concerned that extensive 4 cylinder operation could set up vibrations or unusual loads in the torque tube. Besides, with an auto transmission, the car can go into 4 cylinder operation at any time the paddle shifters are not used to manually operate the transmission. I think it would have been better if they had designed the AFM system for the AT cars to only be operational in the ECO mode.
 

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John, but AFM also works in Sport mode.

What the original poster is saying is that ECO mode (which uses AFM) and Sport mode (which also uses AFM) is resulting in him getting about the same gas mileage. That would make sense if he is driving the car in Sport mode in a manner in which AFM kicks in during most of his drives.

Original poster, how many MPG did you get in ECO mode, and how many MPG did you get in Sports mode? If you are getting 20 in each, you probably should have your car checked. If you are getting 30 in each, it is time to sit back and smile... :)
 

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Thanks, I'm gonna have to turn off sound management. I didn't know about that feature.
Unlike the 2014, if you have a 2015, you won't be able to turn it "off." You'll have the option to choose auto (default), stealth, touring, sport, & track. I have mine set to remain in "track."
 

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Don't think you will notice any difference cruising around town. I only use Eco mode on interstate trips. Got 27 mpg on a trip to Gulf Shores over the 4th of July. Around town I average 17. My fault, can't keep my foot out of it.
 

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Or that, yeah. :) if you can't keep your foot out of it, then the MPG will drop accordingly...
 

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I've been doing a weekly Saturday or Sunday cruise on a combination of interstate and backroads and I do notice an increase in mileage in both 6th and 7th on the highway. I played with it on cruise control when I asked myself the same question, and although not scientific because of wind drag and hills (ok-overpasses in East Texas), I did notice about a 1 - 2 mpg increase in ECO compared to Tour.
 

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Discussion Starter #13
John, but AFM also works in Sport mode.

What the original poster is saying is that ECO mode (which uses AFM) and Sport mode (which also uses AFM) is resulting in him getting about the same gas mileage. That would make sense if he is driving the car in Sport mode in a manner in which AFM kicks in during most of his drives.

Original poster, how many MPG did you get in ECO mode, and how many MPG did you get in Sports mode? If you are getting 20 in each, you probably should have your car checked. If you are getting 30 in each, it is time to sit back and smile... :)
I've been getting 15mpg in each. I usually drive in the city with lots of stoplights. I've been driving today in ECO mode with sound management off and I've been getting 26mpg. I guess it does make a difference.
 

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My C7 is a daily driver. I don't see much difference in gas mileage from one mode to another during the week. My gas mileage depends on how aggressive I drive. I did test the gas theory on a trip this weekend. I drove from Miami to Orlando in touring on the way up. I averaged 28.5 miles/gallon. On the way back I used Eco mode and averaged over 30 miles/gallon. Cruise was set at 75mph and in 7th gear. uploadfromtaptalk1412550603220.jpg
 

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I don't know why the engineers even designed this feature . nobody buys a world class sports car for fuel economy.
Rob, to keep the Govt. off our six, Cafe Regs, Gas Guzzler Tax. The C7 Corvette StingRay is so well rounded, the Govt. is happy, and other manufactures hate it!!

SF
Rick
 

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I don't know why the engineers even designed this feature . nobody buys a world class sports car for fuel economy.
But why not want the best of every aspect, including fuel economy?
 
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My C7 is a daily driver. I don't see much difference in gas mileage from one mode to another during the week. My gas mileage depends on how aggressive I drive. I did test the gas theory on a trip this weekend. I drove from Miami to Orlando in touring on the way up. I averaged 28.5 miles/gallon. On the way back I used Eco mode and averaged over 30 miles/gallon. Cruise was set at 75mph and in 7th gear. View attachment 13880
If one or two mpg is important enough to jerk your engine around between 8 cyl. and 4 cyl., go for it! Do the math and see exactly how much you're saving per year. Not worth it to me.
:cool:
 

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Took a 500 mile trip this weekend running around 75mph, averaged 31.6 mpg in touring mode. 4,200 miles on car 6spd.
 
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