The MPG Post to end all MPG Posts - Page 3 - 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 05-04-2005, 12:31 AM   #21
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year: 1993
model: SE
engine: L27
CAI?: Yes
Other Mods?:Many

Best Observed HW MPG: 34 MPG
Average Observed MPG: 27 MPG

Best Observed City MPG: 26 MPG
Average Observed City MPG 17 MPG
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Old 05-04-2005, 04:47 AM   #22
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Oooh, me too! Would have done this sooner, but I don't usually check the '92-99 forum...

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year: 1989
model: LE
engine: LN3
CAI?: No
Other Mods?: Nothing worth mentioning

Best Observed HW MPG: 29.5 MPG
Average Observed MPG: 25-27 MPG

Best Observed City MPG: Not sure
Average Observed City MPG 18-22 MPG (mixed, some highway, some city)

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I want to know what the heck is up with the cars getting 40 mph on the highway. What, did you tape up the grille, pump the tires to 45 psi, and drive at 50 mph for 300 miles, or what? That'* just crazy good.
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Old 05-04-2005, 02:56 PM   #23
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Unless I missed it somewhere, are we assuming everyone is using regular grade gasoline? I always put in the premium, and STILL only get around 18MPG. :(

1994 SSEi no mods. 97K miles. Just had tuneup also which didn't improve MPG any. Kinda sucks to have such bad MPG using premium.
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Old 05-05-2005, 03:25 AM   #24
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Default Re: The MPG Post to end all MPG Posts

Quote:
Originally Posted by malibuolds
Best Observed HW MPG: not yet tested...
Average Observed HW MPG: not yet tested...
just tested highway MPG yesterday...i got 34.7 MPG/highway!! that is using 85 octane, 250 mile trip with an average speed of 75mph. again, this car is completely stock. i haven't even checked or changed the spark plugs yet! i am IMPRESSED!
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