Gas Mileage Question - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-10-2004, 05:04 PM   #11
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I got the original AC Delco plugs installed today replacing some bosch ones and the milage is allready way better.
I got allready 21 miles/G instead of 17. Thatī* a big difference. I ordered the O2 Sensor so i should be able 2 intall it next week to see the difference. I only had the car now for 5 days but i try 2 do my best. But the car is amazing. Itī* just the best combination of power and luxury. I just have 2 delate all the little problems.
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Old 12-10-2004, 09:35 PM   #12
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I got 34 mpg on a trip to new mexico this summer....70-75 mph.....
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Old 12-10-2004, 11:01 PM   #13
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Michigan Winter air gave me the best milage.... Magic 40.
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Old 12-11-2004, 01:32 PM   #14
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My mpg is horrible, I am getting like 15 mpg city, and 21 mpg highway. I have changed my plugs and my PCV valve. I have 1 step colder plugs. As well as some mods, but would that lower my mpg that much? Tire pressure is fine. I am thinking of switching back to my stock airbox, to see if its my open cone. The only other thing I can think of are the fuel filter, and O2 sensors.
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Old 12-11-2004, 03:20 PM   #15
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Quote:
Originally Posted by BonneMeMN
Michigan Winter air gave me the best milage.... Magic 40.
Yeah, I think Seth, you, Seth'* friend (forgot his name) and me were grinning from ear-to-ear when two Bonneville'* pulled 40+ so it definitely wasn't a fluke.
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Old 12-11-2004, 04:51 PM   #16
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are your plugs made by Bosch too by any chance??? If they are, they need to be replaced by some ACDelcos.
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