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NG900 & OG9-3 Performance, Mods & Tuning Covers Tuning & Performance modifications for the NG900 (1994 to 1998) & OG9-3 (1999-2002) & '03 Convertible

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  #1  
Old 28th November 2007
romberg2 romberg2 is offline
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Default my MPG on sid dropping more every day?

Ever since I installed my new upgrades (Bov, cold air intake, MBC+A, new battery), my MPG on sid keeps dropping. I started out around 20 MPG and now i'm at 14.5. I can watch the thing drop slowly while i'm idling. Most of my driving is city driving but this seems very low.. Any ideas?
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  #2  
Old 28th November 2007
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1) a car that is at idle gets 0 MPG

2) you do know that is an average and not real-time data right?
clear it and try again....
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  #3  
Old 28th November 2007
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Want to dream for a few? Get to teh top of a hill; reset your SID and cruise down the hill at a comfortable 60 MPH. Watch in wonder as your Saab suddenly gets over 100 miles per gallon


The SID gives you an average MPG based on all miles driven since you pressed clear and held it down the last time. As Troll pointed out; if you are sitting still you cannot get any miles per gallon...
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  #4  
Old 28th November 2007
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not to mention it's winter-gas time.
more Additives/gallon = less energy=lower fuel economy.
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  #5  
Old 28th November 2007
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Quote:
Originally Posted by 99Saabnut
Want to dream for a few? Get to teh top of a hill; reset your SID and cruise down the hill at a comfortable 60 MPH. Watch in wonder as your Saab suddenly gets over 100 miles per gallon


The SID gives you an average MPG based on all miles driven since you pressed clear and held it down the last time. As Troll pointed out; if you are sitting still you cannot get any miles per gallon...
Yea, that is fun With my larger injectors the flow rate is off and it will read very high and it always says I am getting 44mph or better even after the average time has expired and when I filled up one day and got on the interstate, it said I had 999 miles to go before I ran out

I was wondering if the car might blow up as it neared the 999 mark and though of the Y-2K thing and it does not go any higher than 999miles to go before you run out of gas....

John
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  #6  
Old 28th November 2007
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Also, how heavy is your foot?

I can keep it at 30MPG on the drive from Rochester to Niagara Falls if i drive steady.

Also i have noticed our cars get better economy when off the highway???
at least mine does...
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  #7  
Old 28th November 2007
John Z Williams John Z Williams is offline
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Yup ideling kills the mpg average and so does city driving because everytime you stop you get 0mpg. If I reset mine on the way to the highway, I get a real 27-30mpg, city driving is more like 19-22mpg and the average for my car in real numbers is 23mpg and thats is getting on it a good bit with 400bhp.

If I cruise on the highway, I can get a real 30mpg if I take it easy...

John
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Old 28th November 2007
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mine drops to 26 on the highway...damn john how do you do that???
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Old 28th November 2007
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By being as easy as possible with the throttle and a larger turbo is more efficient on the highway and usually gets around 4mpg better milage. So when you are cuising, a larger turbo is more fuel efficient!

John
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  #10  
Old 28th November 2007
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You're all kidding, right?
My SID shows 30+ almost all the time.
If I REALLY beat on it, I'll get it down to 24MPG... but that's almost putting effort into it.
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  #11  
Old 28th November 2007
romberg2 romberg2 is offline
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The wierd thing is I just reset it a few days ago Maybe I just have to keep the rpms down I just cant belive a 4 cylinder car gets such low milage.
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  #12  
Old 28th November 2007
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Quote:
Originally Posted by G96nt
You're all kidding, right?
My SID shows 30+ almost all the time.
If I REALLY beat on it, I'll get it down to 24MPG... but that's almost putting effort into it.
I am not talking about the sid, I said it reads 44mpg... I am talking real numbers by filling the tank and seeing how far I get and then noting the mpg by a simple miles driven, gallons used...

John
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  #13  
Old 28th November 2007
John Z Williams John Z Williams is offline
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Quote:
Originally Posted by romberg2
The wierd thing is I just reset it a few days ago Maybe I just have to keep the rpms down I just cant belive a 4 cylinder car gets such low milage.
If you re-set and then do some idling and city driving it will read poorly. They are not that accurate... The only way to really know what mpg you're car is getting is to fill it up and then see how many miles you get out of the tank. Its a 17.4 gallon tank, so if you do the simple math you will see what you're actual mileage.

Some things that will give you poor gas mileage are a dirty fuel filter, dirty air filter, bad spark plugs, bad di. A bad coolant temp sensor directly effects the a/f, so that will give you bad fuel mileage. Weak or bad 02 sensor will also cause it to run rich and give you poor gas mileage and a bad fuel pressure regulator will cause it to run rich and give you poor gas mileage.

Letting the car idle in the morning for long periods will kill you're average mpg too.
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  #14  
Old 28th November 2007
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Id say fill it up and then see how far you get till you fill up again, bam! then you know your real MPG's.
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  #15  
Old 28th November 2007
John Z Williams John Z Williams is offline
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No wait, that is what I said... I only go by the "real mpg" calculated gallons used, miles gone. The sid is really not all that accurate...

John
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  #16  
Old 28th November 2007
romberg2 romberg2 is offline
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Thats all good advice, the only problem is that my fuel guage does not work either! I try to fill it up every few days but I worried I'll forget and run out of gas one of these days..
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  #17  
Old 28th November 2007
John Z Williams John Z Williams is offline
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That is why filling it up and triping you're odometer is the way to one get you're real mpg and two, know when you are out of gas! I get close to 420 miles on my 17.4 gallon tank or close to 23mph average for the tank. If you fill it up at say 300 miles, you will be safe and depending on how much it takes to fill it up, you will then know two things, one how many miles per gallon you got and two, how far you can go before you would run out or have to fill up again! I usually fill up at 350 miles driven to be safe and I usally find it I had about 3 gallons left in the tank, so I could have made it another 75 miles or so....

John
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  #18  
Old 28th November 2007
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When I bought my 900 a few months ago I was getting about 24 on the SID. I filled the tank up and calculated it myself. It turned out the SID was really close. Its about an 18 gallon tank but when my gas light comes on and I fill it up I barely squeeze in just under 15 gallons. So my calculations were on 15. I then realized my PCV and hoses were broke. I replaced those components and was getting roughly 28 for a while but now they have dropped down to an average of about 22 or 23.

bummer.
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  #19  
Old 28th November 2007
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and that's right... it does seem pretty poor for a 4cyl... and i dont punch the turbo that frequently either.
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  #20  
Old 28th November 2007
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As said before...O2 sensor, Plugs and how old it your Cat? It could be plugged up.
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