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Poor fuel mileage

 
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Gems
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PostPosted: Wed Mar 13, 2013 10:31 am    Post subject:  Poor fuel mileage Reply with quote

'01 Impala LS w/3.8L engine...

I seem to be getting very poor fuel mileage lately... I have not checked the mileage as I never really fill up the tank... But I drive almost exactly the same miles on a weekly basis and buy about $20 to $30 gas per week... Lately I have noticed the fuel gauge going down to the 1/4 mark a day or two sooner than normal so I'm thinking my fuel mileage is poor... Plugs and wires are only 6 months old... Car drives and accelerates normally so I don't suspect a clogged CAT... Any thoughts or suggestions?

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05imp
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PostPosted: Wed Mar 13, 2013 6:47 pm    Post subject:   Reply with quote

Could be the summer fuel blend has got to you early.
With the weather the east coast has had forcing some refinerys to shut down. And as they are brought back online with it being late in the winter season that they would just start them on the summer blends rather than bring it all online for a short time on winter blend then have to shut it all down again to reconfigure to summer blend. 2 Cents
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98ss
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PostPosted: Wed Mar 13, 2013 7:16 pm    Post subject:   Reply with quote

I am getting around 24 mpg combined right now. It could be the cold, do you have a mileage figure to give us?
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topgun
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PostPosted: Wed Mar 13, 2013 7:32 pm    Post subject:  gas Reply with quote

Colder weather will lower your gas mileage. Are you starting it and letting it warm up before driving (to get it nice and warm for your drive), excessive idling = more gas. Maybe a fuel filter change. Tire pressures off. Cool

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ImpalaSteve3800
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PostPosted: Wed Mar 13, 2013 10:17 pm    Post subject:   Reply with quote

I was getting 19+ average mpg in town driving over 450 miles when i reset it at the last fill up. Currently averaging 21+ in town with the temps above freezing.
I do not let my car sit and warm up, just long enough to get the fluids circulating.
It is garage kept but I would do the same if it was outside. I would just keep the rpm's down until it was 1/2 way between cold at start and 1st mark on the temp gauge.
Most poor mileage I have seen are due to needing a tune up and letting the engine sit and idle to warm up. Idling to warm up can also cause crud build up in the engine.

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riverwalk100
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PostPosted: Wed Mar 13, 2013 11:12 pm    Post subject:  ok Reply with quote

leaking fuel pressure regulator will cause a sudden decrease in fuel milage. Common problem.

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Gems
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PostPosted: Thu Mar 14, 2013 9:31 am    Post subject:   Reply with quote

98ss wrote:
I am getting around 24 mpg combined right now. It could be the cold, do you have a mileage figure to give us?


No exact fuel mileage at the moment because I never fully fill the tank. I just give the guy $20 or $30 to to it up to about 3/4 tank... I will have to fill up, log miles and fill up again to check the mileage... By the way, I assume the fuel mileage digital display is not very accurate?...

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PostPosted: Thu Mar 14, 2013 10:39 am    Post subject:   Reply with quote

display is not very accurate.

Im stating the obvious here, but if you go by dollar amounts and not by gallons, you can never have an accurate reading. Plus if you give $30 for gas every week and the price changes, you will get more or less gas than the week prior depending on if it goes up or down (down...lol)

Tire pressure
Weight of vehicle (junk in the trunk)
traffic conditions
weather conditions
vehicle condition
driver changes
fuel blend or brand changes

all contribute to changes in MPG

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PostPosted: Thu Mar 14, 2013 10:39 am    Post subject:   Reply with quote

Gotta calculate the MPG by hand before you can make any conclusions. The fuel gauges in these car's are pretty worthless for determining your actual fuel consumption.

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