Poor gas mileage, new LFX - Page 5 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

rtcat600man · 09-24-2015, 05:57 PM

Last 3 months worth of fuel stops, I have everyone since new too.

Date....Miles....Gallons....MPG

VTSummit · 09-24-2015, 07:43 PM

Quote:

Originally Posted by JantzenOKC

So are you saying that our LFX engines are not designed to run on anything higher than 87 and don't get a complete burn with 91 and 93?

I don't think what you are saying is wrong but I think our engines like the higher octane and burn it well. They are just able to run on 87 with the knock sensors and knock reduction(timing retard). That way the masses can buy them and run cheap gas and be happy.

I'm not saying they can't use 93... I am saying that I haven't seen any evidence they can adjust to more than 91 and GM recommends using "regular" low octane in it.

dweith · 10-07-2015, 11:02 PM

As a daily driver I pull 20-22MPG on 89 octane, but if I run 87 my 2LS LFX knocks and pings even under the most conservative behavior and pulls 18-20MPG.

On road trips I can pull 30-31MPG using the cruise and A/C at 70MPH using 89 octane.

My preferred fuel is Shell but will also use BP when Shell is not available.

The only aftermarket changes are a catch can, K&N filter in the stock air box and 37PSI in the tires.

VTSummit · 10-08-2015, 06:23 AM

My IPF tune brought my fuel economy up from 22.4 average to 23.9 in short term testing- but using the exact same route every day of low speed highway and back roads.
I have no idea about highway fuel economy as it's only been on a trip over 45 minutes once since I've owned it.

mr02Z/28 · 10-08-2015, 03:52 PM

<~~~~~ averages 15.1mpg in my '13 2LT Camaro ......

Pathogen · 10-08-2015, 05:27 PM

Quote:

Originally Posted by VTSummit

Running higher octane than the car can adapt to IS bad for your car, period. It WILL reduce fuel economy because you won't get a complete efficient burn. Read up on what octane ratings mean... the higher the number, the more it resists combustion. If you run high octane in a car that cannot adjust to it, it will not completely burn the charge and it will leave carbon deposits that will effectively raise compression and cause you to NEED higher octane to keep from detonating early because of hot spots in your carbon buildup.

FINALLY!!! The voice of reason!!!!!

But ignore science and facts. It feels faster with 93 octane.

oreduks · 01-06-2016, 01:33 AM

from day one to now (15 months and 10K) i still avg 19 town and 29 @ 65 or 31 over 70 on freeway with a Automatic. I can live with that and 87 Oct here in Oregon. Must be the clean air.

derek1387 · 01-06-2016, 03:53 AM

Jeez...wish i could say the same on my M6...but the M6 is geared lower too.

09-24-2015, 05:57 PM	#57
rtcat600man having FUN now 13.66@101 Drives: 2010 2LT IOM Join Date: Nov 2009 Location: Clarkston, Michigan Posts: 9,230 View My Garage	Last 3 months worth of fuel stops, I have everyone since new too. Date....Miles....Gallons....MPG Attached Images __________________ MY BUILD Last edited by rtcat600man; 09-25-2015 at 04:18 AM.

10-08-2015, 06:23 AM	#60
VTSummit Consistently inconsistent Drives: 2015 2LT Summit White Join Date: May 2015 Location: United States Posts: 1,364	My IPF tune brought my fuel economy up from 22.4 average to 23.9 in short term testing- but using the exact same route every day of low speed highway and back roads. I have no idea about highway fuel economy as it's only been on a trip over 45 minutes once since I've owned it. __________________ Thanks to MRR, I have some SWEET wheels! Thank you! 2015 2LT Ported TB, Ported intake, JACFAB intake spacer, Borla exhaust, IPF 91 tune, Complete 1/LE suspension, Brembo brakes, Goodridge lines, Elite catch can, CAI with Thermo-wrap, 275/40-20 x 10's all around, Z/28 spoiler, GM splitter, Alpine/Polk stereo with AudiControl interface.

01-06-2016, 03:53 AM	#64
derek1387 Drives: 2015 1LS Red V6 Join Date: Aug 2015 Location: St Joseph, MO Posts: 1,849	Jeez...wish i could say the same on my M6...but the M6 is geared lower too. __________________ Sponsors: Overkill Motorsport BCS Auto JacFab Machining APDEG Dream Gear Mobile Audio Thanks to Will @ Overkill Motorsports, Jason @ JacFab, Jim @ Ohio Speed, Brandon at Dream Gear, and the boys at Randy Curnow Chevrolet 5th Gen V6 Performance Facebook Group

10-07-2015, 11:02 PM	#59
dweith Drives: 2013 2LS Victory Red Join Date: Mar 2014 Location: Chicago Area Posts: 21	As a daily driver I pull 20-22MPG on 89 octane, but if I run 87 my 2LS LFX knocks and pings even under the most conservative behavior and pulls 18-20MPG. On road trips I can pull 30-31MPG using the cruise and A/C at 70MPH using 89 octane. My preferred fuel is Shell but will also use BP when Shell is not available. The only aftermarket changes are a catch can, K&N filter in the stock air box and 37PSI in the tires.

10-08-2015, 03:52 PM	#61
mr02Z/28 Drives: 2002 Z/28,1968 Chevelle convert. Join Date: Oct 2010 Location: Phila.,PA Posts: 1,141 View My Garage	<~~~~~ averages 15.1mpg in my '13 2LT Camaro ......

01-06-2016, 01:33 AM	#63
oreduks Drives: 2014 Camaro 2LT/RS Join Date: Sep 2014 Location: Eugene, Oregon Posts: 100 View My Garage	from day one to now (15 months and 10K) i still avg 19 town and 29 @ 65 or 31 over 70 on freeway with a Automatic. I can live with that and 87 Oct here in Oregon. Must be the clean air.