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Old 10-27-2010, 12:24 PM   #1
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MPG for the Z28

Somebody please explain. How come adding a SC to the SS improves the fuel economy and how come the CTS-V which makes the same HP as an SS with a SC (~550 hp) only gives 11MPG?
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Old 10-27-2010, 12:35 PM   #2
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Adding a supercharger to an SS does give worse fuel economy. Everyone who says that it increases their fuel economy are not using the EPA tests. to determine their overall MPG.

Z28 will have a gas guzzler tax.
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Old 10-27-2010, 12:37 PM   #3
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Who said adding a SC improves mileage? I don't see how adding weight and parasitic loss to the engine is going to improve mileage. Tweaking the tune could do it, but the same would be true if done an a NA engine.
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Old 10-27-2010, 12:51 PM   #4
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more air + more fuel = more power....any questions the reverse is also true
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Old 10-27-2010, 02:03 PM   #5
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Just wanted to add...I own a 2010 CTS-V and mpg on hwy is 19.7 and around town is 15.2

There is no reason to believe that if the Z28 gets the LSA motor, fuel economy will be worse than that.

I really hope you guys get the LSA motor...it is an absolute blast to drive.
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Old 10-27-2010, 02:53 PM   #6
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maybe if it had a turbo and you kept it out of boost...but supercharger negative...
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Old 10-27-2010, 04:25 PM   #7
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Clear. Then I think I'll pass on the Z. I need a daily driver. I'll just mod the hell out of the SS.
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Old 10-27-2010, 04:37 PM   #8
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Quote:
Originally Posted by 556hp View Post
Just wanted to add...I own a 2010 CTS-V and mpg on hwy is 19.7 and around town is 15.2

There is no reason to believe that if the Z28 gets the LSA motor, fuel economy will be worse than that.

I really hope you guys get the LSA motor...it is an absolute blast to drive.
Thanks for the info 556. I was very curious what the real world MPG numbers are on the CTS-V for City and Highway. Just out curiosity, the highway mileage you obtained is based on what average cruising speed?
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Old 10-27-2010, 04:41 PM   #9
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Clear. Then I think I'll pass on the Z. I need a daily driver. I'll just mod the hell out of the SS.
and what kind of MPG do you think your SS will get after you "mod the hell" out of it???
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Old 10-27-2010, 05:05 PM   #10
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I don't even care, but I don't think it'll be worse than CTS-V. I'm a little suprised that mileage suffers as much as the EPA numbers state. I have seen many comments and statements that people have made about improvements in mileage, but I take them with a little grain of salt. With the bypass valves and more efficient SCs out there, I'd suspect there shouldn't be much of a loss if driving conservatively, but I can't comment either way.

I just know it's not going to sway my decision.
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Old 10-27-2010, 05:20 PM   #11
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I don't think anybody looking to buy a Z/28 will care a whole a lot about MPG. I know I won't.
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Old 10-27-2010, 05:29 PM   #12
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adding forced induction improves the fuel milage amost all the time... aslong as ur not in boost. when your in vaccume ur cars get the best milage, when ur in boost you dumping loads of air into the motor.

who really cares what the z28's milage is. you cant honestly be buying the car worrying about that. 556hp is not gona get u 30mpg.
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Old 10-27-2010, 08:00 PM   #13
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MPG would be my last consideration when buying this car. HP and handling is my only focus.
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Old 10-27-2010, 11:45 PM   #14
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Quote:
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Clear. Then I think I'll pass on the Z. I need a daily driver. I'll just mod the hell out of the SS.
what's your definition of "mod the hell out of?" because if you mean modifying the engine then expect worse gas mileage out of it over stock. . .

like others have said if you're buying this kind of car you aren't really worried too much on mileage.
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Old 10-28-2010, 07:30 AM   #15
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I have a 2003 Harley Davidson F-150 Supercrew with the S/C Lightning engine. The best it gets is 15 mpg. But it is not a daily driver, strictly weekends and when needing to move the family around. The Z28 will not be a daily driver either so MPG is not as big a concern. If the CTS-V is getting 15/20 then the Z28 should e close to that. Is there a gas guzzler tax on the CTS-V coupe & sedan?
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Old 10-28-2010, 07:43 AM   #16
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Adding a S/C alone will not improve FE. Spinning a power sterring pump is a huge drain on FE which is why so many cars are going to EPS. What do you think spinning a S/C does? It takes fuel to drive that S/C even when not providing boost. And as the advantage of a SC is to be always providing boost more air always requires more fuel.
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Old 10-28-2010, 07:47 AM   #17
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There is a gas guzzler tax on both coupe and sedan as will be with the sport wagon out later this year. Under normal driving conditions there isn't any boost applied. The 15.2 is average for a daily driver under normal driving. Obviously it goes down the more you crowd the throttle.
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Old 10-28-2010, 07:49 AM   #18
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Old 10-28-2010, 07:51 AM   #19
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I have a 2003 Harley Davidson F-150 Supercrew with the S/C Lightning engine. The best it gets is 15 mpg. But it is not a daily driver, strictly weekends and when needing to move the family around. The Z28 will not be a daily driver either so MPG is not as big a concern. If the CTS-V is getting 15/20 then the Z28 should e close to that. Is there a gas guzzler tax on the CTS-V coupe & sedan?
The CTS-V offically gets 14/19 with the manual and 12/18 with the automatic, prompting a $1300 gas guzzler tax on the manual and a $2600 tax on the automatic. The Z28 should get the same.
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Old 10-28-2010, 09:08 AM   #20
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Quote:
Originally Posted by bi11ymc View Post
My driving habits yield:

2LT Manual 312HP - 16 city / 26 highway (stock)
2SS Auto 400HP - 15 city / 24 highway (stock)
2SS Auto 650HP - 14 city / 22 highway (highly modified)
That's not, too dang bad for the mods; did you get rid of the AFM, too? I'm sure it takes a lot more restraint in order to get that mileage though

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The CTS-V offically gets 14/19 with the manual and 12/18 with the automatic, prompting a $1300 gas guzzler tax on the manual and a $2600 tax on the automatic. The Z28 should get the same.
Hmm... If it's similar on Z28, I'm thinking that stick is looking a lot better. Shoot - straight off I'm expecting another ~$1000 for a converter if I get an auto', so I'd be able to put that toward some simple bolt-on goodies on the M6
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Old 10-28-2010, 09:41 AM   #21
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I just added an Edelbrock E-Force Supercharger and Comp Cam and my MPG's went from 16 to 13, but on the flip side my HP went from 417RWHP to 639RWHP. If you want the horespower there is a permanent cost to doing it.
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Old 10-28-2010, 10:35 AM   #22
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That's not, too dang bad for the mods; did you get rid of the AFM, too? I'm sure it takes a lot more restraint in order to get that mileage though
New camshaft and L99 to LS3 conversion (no VVT or AFM)
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Old 10-28-2010, 10:37 AM   #23
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Quote:
Originally Posted by 556hp View Post
There is a gas guzzler tax on both coupe and sedan as will be with the sport wagon out later this year. Under normal driving conditions there isn't any boost applied. The 15.2 is average for a daily driver under normal driving. Obviously it goes down the more you crowd the throttle.
I also have a 2010 CTS-V with a manual tranny. If I'm not mistaken, the A6 has a higher gas guzzler tax than the 6MN in the U.S... ($2600 vs. $1300 for the manual while the auto is a no-cost option in the U.S). In Canada, we pay a $400 "green tax" on all Vs, but the auto is a $1700 option here.

Quote:
Originally Posted by OldJedi View Post
Thanks for the info 556. I was very curious what the real world MPG numbers are on the CTS-V for City and Highway. Just out curiosity, the highway mileage you obtained is based on what average cruising speed?
I get approx. the same fuel mileage numbers with my V when converting to the U.S. gal and that's at about 72-73 mph with the A/C on. Again, if speculation is correct and the Z comes in a couple of hundred lbs. less than the V. I'd also suspect mileage wouldn't be any worse.
The other "unknown" would be the gearing, which obviously is still speculation.

FWIW, the auto V has a 3.23 rear end with transmission ratios being:
1st 4.02
2nd 2.36
3rd 1.53
4th 1.15
5th 0.85
6th 0.67

Top speed in the auto is limited to 175 mph because the engineers feel the speed of the output shaft needs to be regulated. (manual Vs are not limited and will hit 191 mph.

The manual V has a 3.73 final drive with a dual disc clutch (an absolute joy to drive!!) and gear ratios as follows:

1st 2.66
2nd 1.78
3rd 1.30
4th 1.00
5th 0.80
6th 0.63

You can expect fuel mileage numbers to drop noticeably in the colder weather, along with traction (while the power will noticeably increase!) and of course, with power like that, it's a HUGE challenge just to keep your foot out of it!! LOL!
Hope this helps...

Best regards,

Elie
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Old 10-28-2010, 11:37 AM   #24
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Originally Posted by garfin View Post
I also have a 2010 CTS-V with a manual tranny. If I'm not mistaken, the A6 has a higher gas guzzler tax than the 6MN in the U.S... ($2600 vs. $1300 for the manual while the auto is a no-cost option in the U.S). In Canada, we pay a $400 "green tax" on all Vs, but the auto is a $1700 option here.



I get approx. the same fuel mileage numbers with my V when converting to the U.S. gal and that's at about 72-73 mph with the A/C on. Again, if speculation is correct and the Z comes in a couple of hundred lbs. less than the V. I'd also suspect mileage wouldn't be any worse.
The other "unknown" would be the gearing, which obviously is still speculation.

FWIW, the auto V has a 3.23 rear end with transmission ratios being:
1st 4.02
2nd 2.36
3rd 1.53
4th 1.15
5th 0.85
6th 0.67

Top speed in the auto is limited to 175 mph because the engineers feel the speed of the output shaft needs to be regulated. (manual Vs are not limited and will hit 191 mph.

The manual V has a 3.73 final drive with a dual disc clutch (an absolute joy to drive!!) and gear ratios as follows:

1st 2.66
2nd 1.78
3rd 1.30
4th 1.00
5th 0.80
6th 0.63

You can expect fuel mileage numbers to drop noticeably in the colder weather, along with traction (while the power will noticeably increase!) and of course, with power like that, it's a HUGE challenge just to keep your foot out of it!! LOL!
Hope this helps...

Best regards,

Elie



^ truth in the above.
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Old 10-28-2010, 01:20 PM   #25
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Quote:
Originally Posted by garfin View Post
I also have a 2010 CTS-V with a manual tranny. If I'm not mistaken, the A6 has a higher gas guzzler tax than the 6MN in the U.S... ($2600 vs. $1300 for the manual while the auto is a no-cost option in the U.S). In Canada, we pay a $400 "green tax" on all Vs, but the auto is a $1700 option here.



I get approx. the same fuel mileage numbers with my V when converting to the U.S. gal and that's at about 72-73 mph with the A/C on. Again, if speculation is correct and the Z comes in a couple of hundred lbs. less than the V. I'd also suspect mileage wouldn't be any worse.
The other "unknown" would be the gearing, which obviously is still speculation.

FWIW, the auto V has a 3.23 rear end with transmission ratios being:
1st 4.02
2nd 2.36
3rd 1.53
4th 1.15
5th 0.85
6th 0.67

Top speed in the auto is limited to 175 mph because the engineers feel the speed of the output shaft needs to be regulated. (manual Vs are not limited and will hit 191 mph.

The manual V has a 3.73 final drive with a dual disc clutch (an absolute joy to drive!!) and gear ratios as follows:

1st 2.66
2nd 1.78
3rd 1.30
4th 1.00
5th 0.80
6th 0.63

You can expect fuel mileage numbers to drop noticeably in the colder weather, along with traction (while the power will noticeably increase!) and of course, with power like that, it's a HUGE challenge just to keep your foot out of it!! LOL!
Hope this helps...

Best regards,

Elie
Elie, thanks so much for the information, it is very valuable. You helped make up my mind between the auto and the stick. It wil definitely be the M6 for me. Between the lower GG tax and the 3.73 gears plus dual disk clutch, it sounds like the way to go at least for my needs. If the CTS-Vs with 3.73 gears are getting in the 15/20 range for city/hwy, that will be good enough. The GT 500 must have just missed the GG tax limit, maybe sometime in the next year Chevy can get 1 or 2 more mpg from the Z28 and avoid the GG tax also. Being from South Florida though i will not be able to take advantage of the really cold air that you get in Canada. By the time a Canadian blizzard gets down here it has already warmed up to 72 degrees. Thanks again, great information.
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