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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 11-26-2010, 09:55 PM   #1
harrington81
 
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Bad MPG?

Hi there. I just wanted to ask u guy's a couple questions about my 2010 2ss, 6speed. Right now i average around 12.5-14 MPG city and very light on the pedal. I did a second fuse pull about 2 months ago and my MPG dropped way down. I took it the dealer to get it scanned and they said it was fine. So i tried a 3rd fuse pull and the next morning the car got way better fuel mileage 20MPG . I left it for 2 days then started it up took it for a drive and the mileage went right back to normal 12.5-14 MPG. I think my car might be reseting it's self back to the low octane table which is why i'm getting horrible fuel economy. I only use premium fuel. Does anybody know whats going on. Why isn't it getting 17-20 MPG like it should. I hope this makes sense.

Thanks for the help!
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Old 11-26-2010, 10:03 PM   #2
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City driving depends alot on how many stops(traffic lights and stop signs i.e.) you make and how long your stopped. Mileage while idling at a stop gives you 0 mph averaged in with your moving mph.
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Old 11-26-2010, 10:20 PM   #3
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could also check your tire pressure, if its low could be the reason
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Old 11-26-2010, 10:33 PM   #4
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I only the brand name gas. And usually the same stations. Inexpensive gas costs more in the long-run. How many miles on your oil, airfilter, what RPM are you crusing at? All things to consider.
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Old 11-26-2010, 11:53 PM   #5
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Hi there. My tire pressure is fine i check it regularly (36 psi) cold. I only use Chevron (94 octane). I changed my oil at about 1000 KMS and i'm currently at 2550 kms. So my car is still brand new. My air filter is the one that came with car. I think my cruising RPM is normal around 2000 grand. Is 12.5 MPG bad because i've seen this car get 18+ MPG city before?
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Old 11-27-2010, 12:17 AM   #6
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something isn't right.. I'm at 20 mpg U.S. gal. city (with a little fun) and 26.5 Hwy. I'd go back to the dealer. Maybe fuel leak? IDK sorry. Let us know when you find out.
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Old 11-27-2010, 01:33 AM   #7
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I have a 6.0 GTO M6 and if I'm trying really hard, I get 29-30 highway and I can average it out to about 23 mixed street with highway.

Its all about knowing when to let off the gas and let it coast my friend.
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Old 11-27-2010, 02:03 AM   #8
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trust me i absolutly baby this thing. I don't drive it hard. Once in a while i'll get on her for sure but i ain't flooring it everywhere. I have a LT1 4th gen that get's about the same or better fuel economy. 12.5 MPG is not good. I guess i'll get it looked at again.

Last edited by harrington81; 11-27-2010 at 02:28 AM.
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Old 11-27-2010, 04:12 AM   #9
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I get about 13 mpg as well. I am not too hard on the gas, but I like to get on it every once in awhile.
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Old 11-27-2010, 06:17 AM   #10
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there's gotta be something wrong cuz I get like 19 on the street and on base. but on the highway I can get up to about 30. I think 17mpg was the lowest i've gotten without getting on it
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Old 11-27-2010, 09:21 AM   #11
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If you have a good tuner up there have them log a file on the car. That will let you see what the timing , A/F is doing. I've had some 2010's come here with totally screwed up factory tunes.They ran fine but the fuel,timing was wrong.We gained good MPG retuning them.
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Old 11-27-2010, 03:42 PM   #12
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I'm getting around 13 MPG right now (mixed city and highway- probably a bit more city though). I wonder if the cold here has something to do with this (and winter fuel). I'm not constantly romping on it either. I do have long tube headers, exhaust, a cam and tune on an L99. I hope it gets better as it warms up though.

My long term fuel trims are reading 5-6% so I don't think that is too far out of whack given what I have seen others with LT headers posting.
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Old 11-27-2010, 04:01 PM   #13
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I have an average of 17.2 mpg with mixed city and highway. I drive my car very hard and it has a couple mods.
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Old 11-27-2010, 05:39 PM   #14
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12-14mpg city driving here?

Now I have a canned tune, would it be better to have it tuned on a dyno?

I have a good tune from Jannetty but it may be my driving? I did take it easy for a couple of days and got 14 .... no where near 17 though!
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Old 11-27-2010, 06:27 PM   #15
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Quote:
Originally Posted by FRANK121 View Post
12-14mpg city driving here?

Now I have a canned tune, would it be better to have it tuned on a dyno?

I have a good tune from Jannetty but it may be my driving? I did take it easy for a couple of days and got 14 .... no where near 17 though!
dyno tunes will always give you the best results, think of it this way, a dyno tune is a custom tune make for your car. a canned tune is a tune from another dynod camaro... but canned tunes are very good, and honestly get the job done. but when you start doing allot of mods then you should be getting it dynod and tuned
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Old 11-27-2010, 07:16 PM   #16
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I've been getting 15-17 city and tested highway this past Sept. 24.3 at average 70-75.
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Old 11-28-2010, 02:31 AM   #17
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I've once seen my mpg at 9 for a while strictly in the city with lots of lights. I average usually about 13-14, so I don't think anythings wrong, its just the situations of when you drive.
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Old 11-28-2010, 11:24 PM   #18
harrington81
 
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So i'm not the only one that's getting fuel mileage like this. I don't think there's a tuner near me. Is there anyway a dealership can try to fix it...do they have the software to do it?

Thanks for the help!

Last edited by harrington81; 11-29-2010 at 08:34 PM.
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