Gas milage - 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 07-18-2007, 02:16 PM   #1
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What kind of MPG are you guys getting with your Bonnies?
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Old 07-18-2007, 02:22 PM   #2
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I can get around 400 miles out a tank with my '93 SSEi driving it easy and not using boost. Driving normal ( which is engine hitting the redline pretty much every time I accelerate ) I can usually get about 330 to 350 miles out of a tank.
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Old 07-18-2007, 02:24 PM   #3
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I can get 16mpg or 28mpg.

Which number do you prefer.
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Old 07-18-2007, 02:34 PM   #4
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im getting about 250 miles on a full 18 gallon tank on my 95 se.? any ideas
yes i drive a lil heavy and quick buut i tuned up the car and replaced almost everything ? what could i do for better millage? thanks
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Old 07-18-2007, 04:05 PM   #5
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Quote:
Originally Posted by 88bonnsse
im getting about 250 miles on a full 18 gallon tank on my 95 se.? any ideas
yes i drive a lil heavy and quick buut i tuned up the car and replaced almost everything ? what could i do for better millage? thanks
I'm not gettting much better than this. Doesn't make much sense to me... When I first bought the car, I was getting about 350 per full tank, now I'm averaging anywhere from 275 - 300 (if I'm lucky and drive mostly highway). Now while I believe fully in an accurate MPG number, still, this amount of drop for a "per full tank" type estimate is still pretty drastic.

Things that I've done:
- New plug wires (AutoLite Prof)
- NGK TR55 spark plugs (gapped .060)
- AC Delco O2 Sensor
- New PCV valve
- New Fuel Filter
- Usual oil changes about every 3000-3500 miles

I'm wondering if maybe a good thorough TB cleaning isn't in order, and I've been looking to replace the cat for a while with a Magnaflow. I'm hoping this will contribute something positive overall.
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Old 07-18-2007, 05:45 PM   #6
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I have been averaging a tick below 16 MPG with almost exclusive city driving. Kinda disappointed. Isn't the car rated at 19mpg city?

Already replaced the spark plugs, and I am going to try replacing the fuel filter and O2 sensor. ..

Any other ideas?
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Old 07-18-2007, 06:02 PM   #7
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mine jumped fron 200 per tank to 300+ per tank after I got one hub assy changed. Wonder what it'll jump to when I get the other one done
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Old 07-18-2007, 07:39 PM   #8
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When the wife drives she gets ~16. When I drive I get ~24 city and 32+ highway.
She doesn't drive highway and plans her city driving ot hit every stop sign possible. LOL
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Old 07-18-2007, 11:21 PM   #9
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I got 345 miles on that 12.83 gallons. But in fact I wan't too happy. That was 90% highway miles at ~70 mph. I hoped to get at least EPA rating of 30 mpg highway because my grand am gets better than its EPA rating.
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Old 07-19-2007, 12:16 AM   #10
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Was getting an avg of 17 with my Bosch oxygen sensor, now getting an avg of 24 mpg with my Denso. a HUGE 70.8% increase! This is about 35% city, 65% highway.
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