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  #1 (permalink)  
Old 12-12-2006, 05:07 AM
charge's Avatar
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Low MPG help..

Hey everyone.

My croc's at 2200 miles. I live in Beverly Hills and drive primarliy in city traffic and use 91 oct gas.

My average MPG is 12 and this is accomplished by shifting under 3000 rpms. When shift agressively (properly) I get around 10Mpg.

My highway MPG average is also low around 22 MPG.

Any ideas on why I'm getting low MPG and suggestions on improving it would be helpful.

Cheers,
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Old 12-12-2006, 05:29 AM
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May I suggest getting a Toyota Prius? LOL.

No but seriously that doesn't sound all that hard to believe. You're talking about BH where it's city driving and hilly. 12mpg is what you'll get with many cars, not only the Cayman.

22mpg is good for highway miles as far as I'm concerned. I've yet to get better than 20-21mpg on the freeway.
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Old 12-12-2006, 06:16 AM
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I would take the car to the dealer.

Unless you are idling in traffic all day, something is wrong.

I get 11.2 mpg on the track.
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Old 12-12-2006, 06:26 AM
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i have a 1600+ and i do most of my driving in bh and drive down to the valley every weekend.
my mpg is at 14.9
mon-fri
-usually in trafic shift around 3k 3200 rpm(leaned stick 3 months ago)
-get around 14.5
weekend-
shift a little hotter 4,200 when having fun
baby the car a little bit get my mpg to around 15.3

then i just do it again!

when driving at high speeds or no traffic, try driving in neutral that way the gears arn't slowing you down. i am a complete newb but this is what works for me.

what colors you car? i have seen a red cayman s around all the time and i followed a new silver one with dealer plates could this be you? pm me
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Old 12-12-2006, 06:43 AM
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Originally Posted by white k-man View Post
when driving at high speeds or no traffic, try driving in neutral that way the gears arn't slowing you down. i am a complete newb but this is what works for me.
Ummm you want to explain that one please?
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Old 12-12-2006, 06:49 AM
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I agree with Fmarshall, that is not right. I am in bumper to bumper slow stop and go and I am always punching it when I can, and I get 13.5 at my worst. See your dealer.

Good Luck,
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Old 12-12-2006, 06:55 AM
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I think that very short trips, starting from cold, cause low mileage, in my case 11-12mpg. I don't have reason to drive longer trips in town. But freeway is usually over 20, interstates 23-24, and open road, even driven with 'spirit' gives over 22. All on 91 octane. Or so says my computer.
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Old 12-12-2006, 07:07 AM
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Originally Posted by TCinOC View Post
Ummm you want to explain that one please?
i feel when i am in neutral the wheels spin more freely and when i am in gear they are slowing me down. I have only been driving stick for 6 months so i obiously dont no anything about it, it is just an observation. if you know any better i would mind learning a thing or two(i dont do this often)
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Old 12-12-2006, 08:25 AM
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Oh boy. Well to start with you would never conceivably be in "neutral" while driving your car. You've got to be engaged in a gear. Only time you'd be in Neutral is at a stoplight for example.
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Old 12-12-2006, 08:51 AM
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sorry to jump on this thread

but my car has a weird MPG too. it always stayed around 15.2 - 15.7

while the later MPG is when im driving on the highway and the initial MPG is from city driving.

is this normal too?
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Old 12-12-2006, 04:25 PM
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Are you guys calculating MPG by actual mileage and fuel used or are you using the onboard computer ? I have never compared the two but I would not be surprised if there was a difference.
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Old 12-12-2006, 05:03 PM
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White K-man - TC is correct. With a manual transmission, while the car is in motion, there should always be drive to the rear wheels. If you're coasting up to a stoplight, or sitting at one is the only time to have the car in neutral. Probably the best reason for not coasting while on the road would be if something happens around you that you need to use the car's drive to avoid, you will be very SOL.

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Old 12-12-2006, 05:31 PM
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when driving at high speeds or no traffic, try driving in neutral that way the gears arn't slowing you down. i am a complete newb but this is what works for me.
First, I think it's pretty clear you are talking about coasting. Interestingly, if you let off the accelerator while in gear and over 1,200 RPMs, you will use even less gas than if you drop it in neutral and coast. Why? Because the motronics stops feeding fuel all together above that speed if you are completely off the throttle, effectively using NO gas during that time.

However, it is debatable which would yield better results because it goes without saying that you will be able to coast much further in neutral even though you are using enough gas to keep the engine idling.
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Old 12-12-2006, 09:36 PM
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Mpg

The other thing to check is to make sure you are looking at mpg and kilometers/liter (or whatever it is they use).
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