low gas mileage? - 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 12-31-1969, 08:00 PM   #1
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I get about 500 km to a tank. That'* 312.5 miles divided by an 18 gallon tank would be 17.36 mpg. I think that'* pretty low. Or maybe it'* not?
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Old 12-31-1969, 08:00 PM   #2
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Yeah, that sounds low. On the highway with my 93 SSE, I could usually get about 27 mpg.

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Old 12-31-1969, 08:00 PM   #3
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I get approx 25mpg on the freeway when I am nice, I just never fill up my tank the full 18 gallons since I live in California and gas is expensive most of the time.
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Old 12-31-1969, 08:00 PM   #4
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Greg,

I think that sounds about right. Maybe it'* a location thing
I live in Ontario, too. I get about 540kms to a tank (if i drive nice with good gas) so that'* like 18.75 miles to the gallon when i figure it all out. The really cold weather and having to allow for warm ups dosn't help the gas gauge much ...plus, your car is getting up there in KM'*...
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Old 12-31-1969, 08:00 PM   #5
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hi,

thanks for the replies. i filled it up the other day and i'm going to try to go easier on the gas to see if that helps. i'll keep you all updated.
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Old 12-31-1969, 08:00 PM   #6
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Greg, on my '92 SE I get about 18mpg in city driving (I deliver pizza with my car as a matter of fact). I do have a little bit of a lead foot but most of the time I try to go easy on it. Our cars really shine on the highway, 75mph while at 2k in overdrive is nice on those long trips, it gets in the high 20s.

If you are really worried about your mileage than change your air filter and oxygen sensor.
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Old 12-31-1969, 08:00 PM   #7
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hehe...i do pizza delivery too.

obviously i'd be getting lower mileage then, but i'm talking about full tanks with no deliveries at all for a fair estimate.

oxygen sensor replaced a few months ago; air filter replaced less than a week ago.
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Old 12-31-1969, 08:00 PM   #8
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Hey Greg, nice to see another Ontario member. I get about 500-540KM per tank and I do mostly Hwy. A lot of small things can effect gas mileage, if the plugs are old it would be a good idea to change them. Check the tire pressure, driving with the window/* down or a/c on can also make a differance. Like Tamara said sometimes higher mileage engines get a little bit more thirsty. But try going easy on the gas for a tank and see what happens...L8r...Andru.
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Old 01-11-2004, 09:43 PM   #9
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hey Greg is that 18 US gallons or Canadian Gallons? Or is it 15 Canadian gallons? Are you getting 17.5mpg or 20 mpg. I will get close to 600 k per 15 gallon canadian tank.
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Old 01-12-2004, 04:12 PM   #10
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when u fill up the tank, do you pump in the full 18 gallons...or is it 16 or 17 gallons?...use the amount it takes you to fill up as the divider instead of automatically dividing by the 18 tank. If you are only adding 16 gallons per each fill up..then thats 19.5mpg
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