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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 12-30-2007, 06:04 PM   #1
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SID says 19.0 mpg..

My commute is fairly short and mostly backroads - is this normal? Supposedly 21 city right?
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Old 12-30-2007, 06:15 PM   #2
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Do you romp on it when going from a stop? If so, you'll get low MPG..

also, your MPG is averaged over the past X many miles since you last reset your SID.

Clear your SID and watch the MPG for a day, it will be more accurate.
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Old 12-30-2007, 06:24 PM   #3
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I think it's average the last 20 minutes or something. It says in the manual if you are curious and want to know for sure.
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Old 12-30-2007, 07:11 PM   #4
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No, its from when you reset it.
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Old 12-30-2007, 07:27 PM   #5
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check your tire pressure... i drive like i stole it and get 24mpg @ 16psi, but if my tires are low then it drops to around 19-20

oh and its all city no highway
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Old 12-30-2007, 07:42 PM   #6
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Originally Posted by mr. twin turbo View Post
check your tire pressure... i drive like i stole it and get 24mpg @ 16psi, but if my tires are low then it drops to around 19-20

oh and its all city no highway

and your tire pressure is?
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Old 12-30-2007, 08:00 PM   #7
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Quote:
Originally Posted by Curlymurt View Post
I think it's average the last 20 minutes or something. It says in the manual if you are curious and want to know for sure.
The DTE takes your average speed over the past 17-20 minutes and the amount of gas left in the tank to extrapolate the number of miles left in the tank.

But the average MPG is your MPG averaged over the total number of miles since the last SID reset, or 9999 miles if you never reset the SID.
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Old 12-30-2007, 08:03 PM   #8
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Originally Posted by 95 900 Manual
Average fuel consumption based on 2.6 gal (10 liters) per 63 miles (100 km) after last clearing.
Unless you press CLEAR after refueling, SID will continue to calculate fuel economy based on the total amount of gasoline used and miles driven.
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Old 12-30-2007, 08:59 PM   #9
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Originally Posted by amish_geek View Post
The DTE takes your average speed over the past 17-20 minutes and the amount of gas left in the tank to extrapolate the number of miles left in the tank.

But the average MPG is your MPG averaged over the total number of miles since the last SID reset, or 9999 miles if you never reset the SID.
Do you suggest resetting the SID every fill up to get accurate reading?
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Old 12-30-2007, 08:59 PM   #10
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Hijack: nice setup you have there. What springs are you running?
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Old 12-31-2007, 03:27 AM   #11
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Originally Posted by amish_geek View Post
The DTE takes your average speed over the past 17-20 minutes and the amount of gas left in the tank to extrapolate the number of miles left in the tank.

But the average MPG is your MPG averaged over the total number of miles since the last SID reset, or 9999 miles if you never reset the SID.
Spoken well. I failed to delineate between the two.

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Do you suggest resetting the SID every fill up to get accurate reading?
Absolutely. Though sometimes it can still be +/- 1 MPG depending on the car.
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Old 12-31-2007, 06:19 AM   #12
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Do you suggest resetting the SID every fill up to get accurate reading?
You can if you want.


I do my own oil changes, so I use the SID to tell me how many miles since my last oil change, so I only clear the SID when I do my changes.

Thus my average MPG is based on oil change to oil change over the past 3-4000 miles.
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Old 12-31-2007, 06:22 AM   #13
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Notice better gas mileage with any different oils then, since its the average of your oil changes?
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Old 12-31-2007, 01:30 PM   #14
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Hijack: nice setup you have there. What springs are you running?
Stock springs, Bilstein shocks & struts. Proven at the WC Meet 07, to be a stiffer suspention then a viggen.

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Old 01-01-2008, 08:53 PM   #15
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My commute is fairly short and mostly backroads - is this normal? Supposedly 21 city right?
No one asked the obvious questions:

Snow involved? Is it an automatic?

I run a weird setup atm, but it's an autobox and my sid says 18.6mpg or somesuch depressing number.

Reset it once merging on the highway; You'll probably see 24-27mpg.

Snow tires affect things; as does winter gas, if it applies.

I think I need a front o2 sensor, but it's not toasted fully.

think it through!

-bny
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Old 01-02-2008, 04:33 PM   #16
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My car never gets much above 19 MPG in town, possible because of all the hills around Seattle. I tried swapping out my Speedparts ECU for a stock one, and there was little or no difference. I don't drive like a maniac, either, and rarely rev my car over 3500 RPM.
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Old 01-02-2008, 04:43 PM   #17
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I am getting shitty milage. SID says 16mpg I do a lot of city driving and its snowing here. My car is a 5spd. I have a high idle that i have been trying to fix.
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Old 01-02-2008, 04:47 PM   #18
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Before I started commuting 100+ miles/day I could never ever get my car out of the mid-teens...of course the car spent it's time flighting thru traffic around the city on weekends with no highway driving.
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