SS gas mileage getting worse over time? - Page 2

ctrlz · 09-12-2018, 10:37 AM

Quote:

Originally Posted by Need4Camaro

It's about time someone is honest about this.

People here are reporting the SS is a 30 - 35 MPG sports car on average and that is far from true. On average its a 20 street - 25 highway MPG car.

These numbers reflect my experience.
I was never expecting more, and think those numbers are VERY respectable given the displacement and horsepower.
Hopefully Chevy doesn't hire VW engineers and start selling 50 mpg V8 cars.

Allez · 09-12-2018, 11:04 AM

Check your tire pressure.

DaveC113 · 09-12-2018, 11:07 AM

I expect about the same mileage as my '16 STi, with 1.5x the power and 350 lbs more weight. The Camaro SS M6 EPA rating is better on the highway vs the STi, with A8 it's even better. It is surprising, but the STi's AWD system is a major power suck.

Wyzz Kydd · 09-12-2018, 12:27 PM

My 2016 SS A8 averaged 20.9 combined over the first 40,000 miles. My 2018 SS 1 LE is averaging 17.8 over the first 1,700 miles.

kropscamaro16 · 09-12-2018, 01:37 PM

lol shit im full bolt ons and tune and i only get about 18-20 on highway and like 13-15 on streets so be lucky

Rock-It Man · 09-12-2018, 05:10 PM

It's real. I experienced this back in 2010 with my new SS.

After using the eggshell approach to the throttle during break-in, and getting north of 26 mpg, I began driving normally and the mileage dropped to 22, where it has stayed ever since.

If not for all the road trips (my favorite use for this car), I'm sure it would be well under 20 mpg.

protovack · 09-12-2018, 06:00 PM

thanks for all the responses
I think winter gas might be in effect already for me
I might be giving the car more gas as it breaks in, yes.
The reason I mentioned doing the track day and not changing the oil after, is that in other cars I've seen a sharp drop in fuel economy when the oil needs to be changed. And then right after I change it, mpg increases back to normal. So I want to see if it gets better right after I change the oil next.
The MPG seems very related to speed, more so than with other cars. If you start climbing north of 60mpg the MPG drops rather quickly.
With my silverado, it doesn't matter much whether I'm driving 55 or 65 its exactly the same MPG. Not so with the Camaro.

drperry · 09-12-2018, 06:11 PM

Hand calculate your fuel mileage... Never trust the computer, lol. I'm averaging 16ish to and from work... Now that it's broken in, I can probably squeeze 17 out if it, since I can keep it at a lower RPM... The M6 doesn't seem to lug as long as it stays over 1000RPM, lol

Sent from my SM-G930W8 using Tapatalk

Jeb114 · 09-13-2018, 10:22 AM

There has been a trend of High Pressure fuel pumps having problems. Have the dealer check it. The pump seems to make a ticking noise above the normal injector noise when it starts to go bad.

BrianL · 09-13-2018, 10:30 AM

I remember my big block '69 428 Mustang with the Cobra Jet 428 getting all of 7 mpg on average. So low 20's for a car with more torque and HP is still amazing to me...

craigss50 · 09-13-2018, 11:46 AM

Quote:

Originally Posted by drperry

Hand calculate your fuel mileage... Never trust the computer, lol. I'm averaging 16ish to and from work... Now that it's broken in, I can probably squeeze 17 out if it, since I can keep it at a lower RPM... The M6 doesn't seem to lug as long as it stays over 1000RPM, lol

Sent from my SM-G930W8 using Tapatalk

Yep it's even worse than you think because the computed display MPG is about 1-2 MPG off when you do a manual calculation.

JaxChris · 09-13-2018, 01:41 PM

2016 2SS on the same stretch of highway, in the same weather, in the same month
Before trans/diff flushes and working AFM = 35.3mpg over 25 miles at 70mph
After trans/diff flushes and working AFM = 32.9mpg over 25 miles at 70mph
After trans/diff flushes and disabled AFM (Range device for testing) = 26.8mpg over 25 miles at 70mph

After seeing the drop from disabling AFM, I returned the Range device.

Expectation of e85 and tune (no other mods) would put it down around 23.2mpg. Doing FBO or H/C after that would bring it down to ~20.5mpg. And swapping to a mild converter with a TCM tune to smooth out the driving experience would probably cost another 0.5mpg.

Going from 35mpg on 93o to 20mpg on e85, at 15k miles per year, is a fuel bill of 1350$/yr (93o) vs 1875$/yr (e85). But then there is 370whp vs 570whp. If I didn't go e85 and went for 500+whp on 93o, then the mpg would be around 22mpg and the fuel bill would be 2200$/yr. Going e85 definitely pays for itself.

Lafourche1 · 09-13-2018, 02:15 PM

I averaged 24.0 MPG on a 4,000 mile road trip in my 2016 M6 2SS. Most of the time I averaged ~13-14MPG in city stop...….. and now go, driving.

My ZL1 is getting slightly better mileage than my SS did. Nothing to brag about, still.

mdhopt36 · 09-14-2018, 08:41 AM

"why go from a V6 to a V8 if you drive it gently enough to get "30-35" mpg?"
******
25 miles from nearest expressway, so around here most of the time as a D/D; yes, you have to drive with an IQ greater than 2-digits; with cops thicker than outhouse flies, a drug operation going on somewhere in the area, and school startup with kids and busses scattered around. And the propensity of idiots painting bike lanes recently all over 4-lane roads, and cutting them down to 2-lanes---for bozo's that pay nothing to maintain the infrastructure. Don't get me started on that one.
But if you're talking expressway, yeah, I get 27 at average 85-90mph barring any cops with Kodaks.
6500~ miles on 6 month old car, so it doesn't do a whole lot of holding a garage-queen title.
Plus, wife starts to bitch if I get the right foot syndrome if she's with me.

Downhill record to work with no busses or kids, 39.1. Going back up, 25~ dropping the average to 32~
Totally realistic.

09-12-2018, 01:37 PM	#19
kropscamaro16 Drives: 2016 1ss camaro Join Date: Feb 2016 Location: 909 Posts: 10,130	lol shit im full bolt ons and tune and i only get about 18-20 on highway and like 13-15 on streets so be lucky __________________ 16 1SS NIGHTFALL GRAY METALLIC WITH NPP #BECAUSERACECAR #SAVETHEMANUALS

09-13-2018, 02:15 PM	#27
Lafourche1 Drives: 2019 CLA 450 Mercedes Join Date: May 2016 Location: South Louisiana Posts: 1,107	I averaged 24.0 MPG on a 4,000 mile road trip in my 2016 M6 2SS. Most of the time I averaged ~13-14MPG in city stop...….. and now go, driving. My ZL1 is getting slightly better mileage than my SS did. Nothing to brag about, still. __________________ 2019 Lunar Blue Metallic Mercedes CLS 450 2021 C43 AMG Mercedes Coupe Metallic Cardinal Red 2014 Lincoln MKT EcoBoost (The Bus)

09-12-2018, 11:04 AM	#16
Allez Drives: 2016 Camaro 2SS Join Date: Jun 2016 Location: Maryland Posts: 810	Check your tire pressure.

09-12-2018, 11:07 AM	#17
DaveC113 Drives: 2018 Camaro 1SS 1LE Join Date: Sep 2018 Location: Front Range, CO Posts: 2,204	I expect about the same mileage as my '16 STi, with 1.5x the power and 350 lbs more weight. The Camaro SS M6 EPA rating is better on the highway vs the STi, with A8 it's even better. It is surprising, but the STi's AWD system is a major power suck.

09-12-2018, 12:27 PM	#18
Wyzz Kydd Banned Drives: 2018 Camaro SS1 1LE Join Date: Feb 2017 Location: Georgia Posts: 1,595	My 2016 SS A8 averaged 20.9 combined over the first 40,000 miles. My 2018 SS 1 LE is averaging 17.8 over the first 1,700 miles.

09-12-2018, 05:10 PM	#20
Rock-It Man 376 cubic inches of fun Drives: 2023 Camaro ZL1 A10 Join Date: Jul 2010 Location: MA Posts: 4,043 View My Garage	It's real. I experienced this back in 2010 with my new SS. After using the eggshell approach to the throttle during break-in, and getting north of 26 mpg, I began driving normally and the mileage dropped to 22, where it has stayed ever since. If not for all the road trips (my favorite use for this car), I'm sure it would be well under 20 mpg.

09-12-2018, 06:00 PM	#21
protovack Drives: 2019 2LT 2.0T M6 Riverside Blue Join Date: Jan 2018 Location: WA Posts: 847	thanks for all the responses I think winter gas might be in effect already for me I might be giving the car more gas as it breaks in, yes. The reason I mentioned doing the track day and not changing the oil after, is that in other cars I've seen a sharp drop in fuel economy when the oil needs to be changed. And then right after I change it, mpg increases back to normal. So I want to see if it gets better right after I change the oil next. The MPG seems very related to speed, more so than with other cars. If you start climbing north of 60mpg the MPG drops rather quickly. With my silverado, it doesn't matter much whether I'm driving 55 or 65 its exactly the same MPG. Not so with the Camaro.

09-12-2018, 06:11 PM	#22
drperry Drives: Chevy Blazer Join Date: Sep 2009 Location: Grande Prairie, AB Posts: 300	Hand calculate your fuel mileage... Never trust the computer, lol. I'm averaging 16ish to and from work... Now that it's broken in, I can probably squeeze 17 out if it, since I can keep it at a lower RPM... The M6 doesn't seem to lug as long as it stays over 1000RPM, lol Sent from my SM-G930W8 using Tapatalk

09-13-2018, 10:22 AM	#23
Jeb114 Drives: 2021 300 Join Date: Jan 2015 Location: New Jersey Posts: 968	There has been a trend of High Pressure fuel pumps having problems. Have the dealer check it. The pump seems to make a ticking noise above the normal injector noise when it starts to go bad.

09-13-2018, 10:30 AM	#24
BrianL Drives: 2016 2SS, Red Hot, NPP, Nav, M6 Join Date: Jul 2016 Location: Eagle Creek OR Posts: 783	I remember my big block '69 428 Mustang with the Cobra Jet 428 getting all of 7 mpg on average. So low 20's for a car with more torque and HP is still amazing to me...

09-13-2018, 01:41 PM	#26
JaxChris Drives: '16 2SS GD1 MX0 NPP F55 IO6 Join Date: Jun 2013 Location: Florida Posts: 1,298	2016 2SS on the same stretch of highway, in the same weather, in the same month Before trans/diff flushes and working AFM = 35.3mpg over 25 miles at 70mph After trans/diff flushes and working AFM = 32.9mpg over 25 miles at 70mph After trans/diff flushes and disabled AFM (Range device for testing) = 26.8mpg over 25 miles at 70mph After seeing the drop from disabling AFM, I returned the Range device. Expectation of e85 and tune (no other mods) would put it down around 23.2mpg. Doing FBO or H/C after that would bring it down to ~20.5mpg. And swapping to a mild converter with a TCM tune to smooth out the driving experience would probably cost another 0.5mpg. Going from 35mpg on 93o to 20mpg on e85, at 15k miles per year, is a fuel bill of 1350$/yr (93o) vs 1875$/yr (e85). But then there is 370whp vs 570whp. If I didn't go e85 and went for 500+whp on 93o, then the mpg would be around 22mpg and the fuel bill would be 2200$/yr. Going e85 definitely pays for itself.

09-14-2018, 08:41 AM	#28
mdhopt36 Drives: '17- 1ag37 V6 traded, for 1SS 2018! Join Date: Mar 2018 Location: MA Posts: 469	"why go from a V6 to a V8 if you drive it gently enough to get "30-35" mpg?" ****** 25 miles from nearest expressway, so around here most of the time as a D/D; yes, you have to drive with an IQ greater than 2-digits; with cops thicker than outhouse flies, a drug operation going on somewhere in the area, and school startup with kids and busses scattered around. And the propensity of idiots painting bike lanes recently all over 4-lane roads, and cutting them down to 2-lanes---for bozo's that pay nothing to maintain the infrastructure. Don't get me started on that one. But if you're talking expressway, yeah, I get 27 at average 85-90mph barring any cops with Kodaks. 6500~ miles on 6 month old car, so it doesn't do a whole lot of holding a garage-queen title. Plus, wife starts to bitch if I get the right foot syndrome if she's with me. Downhill record to work with no busses or kids, 39.1. Going back up, 25~ dropping the average to 32~ Totally realistic.

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