Bad gas mileage question!! - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

thebighar · 12-09-2009, 06:36 PM

Can anyone tell me why i'm getting crappy mileage with 5500 miles on my 6 cylinder. i average around 300 per tank and now i seem to be getting 250.

Russell James · 12-09-2009, 06:42 PM

Did they recently switch to winter gas in the area? Sometimes that can make a noticeable difference. Tire pressure up? Temps drop like a rock in the area, which will really richen up the cold starts. Often it's a combination of all of the above in the winter.

Just about anything really wrong with the engine would turn on the check engine light. You could try a highway mpg test. Set the cruise on the highway, reset the mpgs to zero and drive 10 miles or so and see where it is. Or the old school way of dividing out the miles and gallons.

TJ91 · 12-09-2009, 06:57 PM

how many miles do you have on it?
I remember my first 2 thousand were somewhere around 14.5mpg all city and that was with shifting at 2200-3400 rpm
it will get better, i dont know what the conversion is but i have about 5000 km on it now and get about 14L/100km for 90% city driving, and thats driving like an ass

mjlash22 · 12-09-2009, 07:09 PM

Quote:

Originally Posted by Russell James

Did they recently switch to winter gas in the area? Sometimes that can make a noticeable difference. Tire pressure up? Temps drop like a rock in the area, which will really richen up the cold starts. Often it's a combination of all of the above in the winter.

Just about anything really wrong with the engine would turn on the check engine light. You could try a highway mpg test. Set the cruise on the highway, reset the mpgs to zero and drive 10 miles or so and see where it is. Or the old school way of dividing out the miles and gallons.

The gas and tire pressure could be what's doing it. You burn through gas quicker in the colder months anyhow.

rolnslo · 12-09-2009, 07:11 PM

Quote:

Originally Posted by Russell James

Did they recently switch to winter gas in the area? Sometimes that can make a noticeable difference. Tire pressure up? Temps drop like a rock in the area, which will really richen up the cold starts. Often it's a combination of all of the above in the winter.

Just about anything really wrong with the engine would turn on the check engine light. You could try a highway mpg test. Set the cruise on the highway, reset the mpgs to zero and drive 10 miles or so and see where it is. Or the old school way of dividing out the miles and gallons.

Keep an eye on how much time you spend idling too. Warming the car up produces 0mpg. The longer the warm-up time, the lower the miles per tank. I used to get noticeably worse miles per tank in my truck during the winter simply because my idling time increased while waiting for it to warm up.

thebighar · 12-09-2009, 07:14 PM

Thanks everyone, i was thinking all those things but 50 miles a tank less seemed excessive. Got to watch the remote start in the winter....it's soooo nice though.

springerpete · 12-09-2009, 07:25 PM

Also if they use ethanol mix in your fuel it will result in less mpg.

Sevn86 · 12-09-2009, 07:32 PM

my car has 590 miles on it and it is giving me horrible gas mileage even with supreme gas...its expensive and i only get around 290 a tank and the fastest ive gone is 68 mph...

wullger · 12-09-2009, 07:40 PM

Have you had your oil changed since you got the car?

SSouthernboy · 12-09-2009, 08:01 PM

Wow, I haven't averaged lower than 19 mpg in my 2SS M6, and I drive my car hard and get high in the rpm's a lot.

Dave the Mule · 12-09-2009, 08:01 PM

Quote:

Originally Posted by Sevn86

my car has 590 miles on it and it is giving me horrible gas mileage even with supreme gas...its expensive and i only get around 290 a tank and the fastest ive gone is 68 mph...

I don't think the supreme gas is going to improve your gas mileage any. The only real difference to the supreme is the octane; it's not any more combustible. I run regular in my V6. I've been getting around 23-24 mpg.

Toastylicious · 12-09-2009, 08:43 PM

I run supreme in mine and get around 320 a tank. Also it keeps everything a little cleaner than regular. Arnt we supposed to run midgrade in the v6 anyways????

mydreamcar · 12-09-2009, 08:45 PM

lets not forget the fact the 19 city and 29 highway is based on driving 50-55 mph on the highway with no hard stops and quick accelerations. even if you don't jump on the car and do 65-70 mph your mpg will drop big time on these v6, its a 3.6L not a 2.0. so your gonna waste gas. I am in NYC so I am lucky if I see 17 or even 18 mpg to the gallon, thats a combo of highway driving and city driving, say about 50/50. I usually around 70-80 mph on the highway

mikel441 · 12-09-2009, 08:55 PM

Wow, I get 370-400 miles per tank in my SS. Even gettin on it evey so often. Using 76 fuels Super unleaded, first oil change at 2900 miles and I use Valvoline Synthetic. The worst I have seen was when I picked up the car before getting completely broke in. The first tank was 350. The most I have seen is 404 miles.

12-09-2009, 06:36 PM	#1
thebighar Drives: 2018 1LT RS V6 Nightfall Grey Join Date: Jun 2009 Location: Willow Grove PA Posts: 570	Bad gas mileage question!! Can anyone tell me why i'm getting crappy mileage with 5500 miles on my 6 cylinder. i average around 300 per tank and now i seem to be getting 250.

12-09-2009, 07:25 PM	#7
springerpete Orange GM freak Drives: 2004 3500HD Join Date: May 2009 Location: Ponca City, OK Posts: 784 View My Garage	Also if they use ethanol mix in your fuel it will result in less mpg. __________________ "My hair's turnin' White, my neck is still Red and my collar is still Blue"

12-09-2009, 07:40 PM	#9
wullger Supercharged Drives: 2010 Camaro 2SS/RS Join Date: Apr 2009 Location: Tyler, Texas Posts: 1,575 View My Garage	Have you had your oil changed since you got the car? __________________ 2SS/RS IBM A6, White Rallies Ordered: 4/30/09 Delivered: 8/18/09 Appearance Mods: Heritage Grille, ZL1 Replica Wheels Performance Mods: Flowmaster ARH Cat-Back Exhaust, ADM CAI, ADM L99-LS3 Conversion, ADM LSA Supercharger Kit, Lingenfelter GT9 Cam, Stainless Power Headers, Detroit Speed Sway Bars, ZL1 Fuel Pump 581 rwhp/535 lb/ft tq

12-09-2009, 08:55 PM	#14
mikel441 Drives: 2014 Sonic, 2010 Camaro SS Join Date: Jan 2009 Location: Gig Harbor, WA Posts: 2,451 View My Garage	Wow, I get 370-400 miles per tank in my SS. Even gettin on it evey so often. Using 76 fuels Super unleaded, first oil change at 2900 miles and I use Valvoline Synthetic. The worst I have seen was when I picked up the car before getting completely broke in. The first tank was 350. The most I have seen is 404 miles. __________________

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12-09-2009, 06:42 PM	#2
Russell James Drives: '15 SS 1LE, '69 Z28 drag car Join Date: Dec 2009 Location: Mich Posts: 4,482	Did they recently switch to winter gas in the area? Sometimes that can make a noticeable difference. Tire pressure up? Temps drop like a rock in the area, which will really richen up the cold starts. Often it's a combination of all of the above in the winter. Just about anything really wrong with the engine would turn on the check engine light. You could try a highway mpg test. Set the cruise on the highway, reset the mpgs to zero and drive 10 miles or so and see where it is. Or the old school way of dividing out the miles and gallons.

12-09-2009, 06:57 PM	#3
TJ91 :chevy: Drives: 2LT/RS Join Date: Jun 2008 Location: Toronto Posts: 13,035	how many miles do you have on it? I remember my first 2 thousand were somewhere around 14.5mpg all city and that was with shifting at 2200-3400 rpm it will get better, i dont know what the conversion is but i have about 5000 km on it now and get about 14L/100km for 90% city driving, and thats driving like an ass

12-09-2009, 07:14 PM	#6
thebighar Drives: 2018 1LT RS V6 Nightfall Grey Join Date: Jun 2009 Location: Willow Grove PA Posts: 570	Thanks everyone, i was thinking all those things but 50 miles a tank less seemed excessive. Got to watch the remote start in the winter....it's soooo nice though.

12-09-2009, 08:01 PM	#10
SSouthernboy Drives: 2010 CGM 2SS/RS Join Date: Dec 2008 Location: Houston, TX Posts: 114 View My Garage	Wow, I haven't averaged lower than 19 mpg in my 2SS M6, and I drive my car hard and get high in the rpm's a lot.

12-09-2009, 08:43 PM	#12
Toastylicious My car goes Vrooom.. You? Drives: 2010 Rally Yellow Camaro LS Join Date: Oct 2009 Location: Everett Washington Posts: 138	I run supreme in mine and get around 320 a tank. Also it keeps everything a little cleaner than regular. Arnt we supposed to run midgrade in the v6 anyways????

12-09-2009, 08:45 PM	#13
mydreamcar My Dream Car Drives: 2011 SIM LS3 1SS Join Date: Jul 2009 Location: staten island Posts: 1,534	lets not forget the fact the 19 city and 29 highway is based on driving 50-55 mph on the highway with no hard stops and quick accelerations. even if you don't jump on the car and do 65-70 mph your mpg will drop big time on these v6, its a 3.6L not a 2.0. so your gonna waste gas. I am in NYC so I am lucky if I see 17 or even 18 mpg to the gallon, thats a combo of highway driving and city driving, say about 50/50. I usually around 70-80 mph on the highway