whyyy am i getting 15 mpg - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


2000-2005 Discuss your 2000-2005 Bonneville SE, SLE, and SSEi Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-08-2007, 08:59 PM   #11
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mark, i got the same exact size tire. 225/60 16

ill look into replacing the o2
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Old 08-28-2007, 12:10 AM   #12
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Me too. Mileage dropped from 26 (my normal average) to 16, bam, in one week. And 18 the next week. Only reason I know is we put all our gas receipts in a spreadsheet. Tires are all 35-40psi and the 4 spark plugs I could get to were replaced last fall. I almost blamed my neighbor for stealing gas and then I remembered the gas door is locked

If you find an "open-at-8pm" place with the Denso or Delco 02 sensors let me know too. Sounds like a good place to start.
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Old 08-28-2007, 01:05 AM   #13
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Doesn't sound unusual to me.
I average 15 mpg around town with short trips. Once warmed up, it will get much better mileage like around 18.
Of course it depends on how loud you like to listen to your engine roar. :P

On the highway I can average 26 mpg
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Old 08-29-2007, 11:10 PM   #14
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hahaa, nice one. sometimes i just wanna hear the full choir when i press the gas, not a solo peice. ( if youre a music buff you'll get that)

its doing much better all around. cleaned out a few things.
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Old 08-30-2007, 11:35 PM   #15
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I got it!
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