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Old Jan 12, 2015 | 10:12 PM
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Default LS4 mileage

I have a 06 Grand Prix gxp and am getting about 12.5mpg city, is thiswhat they are all like?
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Old Jan 12, 2015 | 11:31 PM
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Originally Posted by Nicks22
I have a 06 Grand Prix gxp and am getting about 12.5mpg city, is thiswhat they are all like?
If you're stock it is. I'm pretty modified (look in my sig) and I let mine warm up for around 10min every morning in the winter and still usually get around 12-13 city. When I was 100% stock I was getting 16.5 city and 26-28 hwy for comparison.
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Old Jan 13, 2015 | 01:00 PM
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Mine is completely stock, and I'm only getting 12.5 city I would of Thought I'd atleast get about 16
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Old Jan 13, 2015 | 03:20 PM
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Give us more details about your driving. Both your driving and the roads you are driving on. That seems low, but not unreasonable. I could get that low depending on roads and how I was driving.
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Old Jan 13, 2015 | 04:05 PM
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I don't really beat on it at all. I baby it 98%of the time. Just regular city roads quite a few stops lights and stop signs and all that.
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Old Jan 13, 2015 | 06:22 PM
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Earlier in another post you posted some codes, one was to do with your security system as I mentioned... curious whether or not you got it working.

BUT there were 2 other codes, both had to do with your induction system sort of speak.
Is the hose between the MAF sensor and the throttle body properly secured, including the crankcase breather tube.
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Old Jan 13, 2015 | 06:26 PM
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Nope haven't got it working yet, not sure what the problem is yet. And I'll have to check that in the morning and I'll let you know.
B3101 keyless entry data link circuit range/ performance
P1101
P0171
And yes Those are the codes it threw
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Old Jan 17, 2015 | 07:45 PM
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Default milage

when is last time u did a tune-up clean tb ,maf ect.?change plugs see what u get
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Old Jan 17, 2015 | 09:10 PM
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If u use gas with 10% eth all the time, tuning the stioch afr base to 14.2-14.4 can up your mpg also
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Old Jan 17, 2015 | 10:06 PM
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Yea I'm planning on changing the plugs and wires soon! And what's the stioch afr base?
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Old Jan 18, 2015 | 03:47 AM
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yeah I get around 12 city 24 hwy
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Old Jan 18, 2015 | 08:52 AM
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I cleaned my MAF at 90k and found that to significantly help performance and efficiency.
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Old Jan 18, 2015 | 05:53 PM
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Originally Posted by Nicks22
Yea I'm planning on changing the plugs and wires soon! And what's the stioch afr base?

http://www.turbobygarrett.com/turbob...g_rich_vs_lean
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Old Jan 18, 2015 | 05:57 PM
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damn midnite we got same upgrades-like a mirror lol
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Old Jan 19, 2015 | 10:13 AM
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Only reason I remember what stoichiometry means is because my Chemistry teacher was HOT.... (insert Van Halen here)

But in all seriousness, just clean the MAF and run some injector cleaner through
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Old Jan 19, 2015 | 03:17 PM
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my stoich afr is set to 14.1 across the whole table (apparently the stock 14.6 stoich setting is incorrect for the 10% ethanol gas found across most of the usa), along with a minor timing adjustment i get another 3 mpg
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