2007 Gxp MPG up and down

2007 Gxp MPG up and down

Postby Sttaaapppeeennn » Wed Apr 17, 2013 6:46 pm

My girlfriends gxp miles per gallon hops up and down randomly. She Normally gets 18 to 20 mpg but it was just jumping from 18 to 25 to 28 to 30 back to 25 then back to 30. Any thoughts of what can cause this?
2000 Grand Prix GTP -- TEP TRANS , TURBOCHARGED. PT67 /1.9 Mod Rockers/CC Valve Springs 105's/Plog/48lb Injectors / Borla Exhaust/ Cartuning PCM / KYB Struts/K&N Intake/Autolite 103/ SD Appearance Package / Tuned by Deekster Derek and Myself ------------------PB - 13.7 at 102.4 MPH <<< soon to be broken!!!
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Re: 2007 Gxp MPG up and down

Postby deekster_caddy » Thu Apr 18, 2013 9:04 am

Actual? Just on the DIC? average? Instantaneous? How quickly is "Jumps"?

Instantaneous will jump all over the place all the time. Average should hold pretty steady.

If the average was reset recently it can move much quicker than a long term average will move.
'98 Buick Riviera; Gen V 3.2 pulley, N*, VS Cam, 180 stat, Custom PCM (Powrtuner), headers & HF cat , 42.5 lb inj.
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Re: 2007 Gxp MPG up and down

Postby Sttaaapppeeennn » Thu Apr 18, 2013 9:48 am

i know instantaneously moves all the time. Its under average and it was not reset. Its probably not an issue but just checking to see if it was.
2000 Grand Prix GTP -- TEP TRANS , TURBOCHARGED. PT67 /1.9 Mod Rockers/CC Valve Springs 105's/Plog/48lb Injectors / Borla Exhaust/ Cartuning PCM / KYB Struts/K&N Intake/Autolite 103/ SD Appearance Package / Tuned by Deekster Derek and Myself ------------------PB - 13.7 at 102.4 MPH <<< soon to be broken!!!
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Re: 2007 Gxp MPG up and down

Postby deekster_caddy » Thu Apr 18, 2013 10:22 am

Just making sure! Have to ask these days!

Anything whacky going on with the speedometer/odometer? ABS/Trac? SES codes?
'98 Buick Riviera; Gen V 3.2 pulley, N*, VS Cam, 180 stat, Custom PCM (Powrtuner), headers & HF cat , 42.5 lb inj.
Grant-built/PRJ/Thrasher trans 3.29 gears, 7/8 chain, zzp hardened IS
13.8@101 ET
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Re: 2007 Gxp MPG up and down

Postby Swiggles » Thu Apr 18, 2013 1:33 pm

When the mileage is lower has she been driving faster? When it was higher was she using the highway more?
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Re: 2007 Gxp MPG up and down

Postby Specter GXP » Mon Apr 22, 2013 6:32 pm

yea its all over the place..mine is acting up..
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