- #88 of 117
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Re: 2002 3.4 gas mileage [bena8837]
by nosirrahg
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Jun 16, 2008 (9:23 am)
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Replying to: bena8837 (Jun 16, 2008 8:21 am)
How many miles do you have on it? Could it be your catalytic converter is getting clogged? If you feel like you're losing power as well, that might be the culprit (I never had a problem with mine, but I know others here has posted stories about the converter clogging up and causing power/economy problems.
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- #89 of 117
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Re: 2002 3.4 gas mileage [nosirrahg]
by bena8837
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Jul 31, 2008 (6:59 am)
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Replying to: nosirrahg (Jun 16, 2008 9:23 am)
I started writing about a 10 mile loss in mpg several months ago. I tried everything I knew could be the problem by replacing the spark plugs(which appear to be fine), Air Filter, Fuel Filter, Cleaning the MAFF ? Filter on the air intake with spray, and finally had it taken to a (Best of the Best) Shop and had it (analyzed). They told me the ejectors needed cleaning and I said Ok. Drove it home and no change. Since then, when I have time I go under the hood and look at possibilities. About 3 weeks ago I notice moisture aroung the Coolant Temperature Sensor. So I decided to replace it. I drove to Dallas about a week later and guess what, I regained my MPG, 31+. Also, on the way there (about 400 miles away) I started having problems with the catalytic Converter and had it replace when I got there. It was still in warranty since my car only has 60K. My car always appeared to run in a temperature of about 191 degrees, which I believe I had read was within range. Heads Up to everyone who owns car with 3.4. Thanks for your help, appreciate it!
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- #90 of 117
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2008 LT 50th Edition
by saxe10595
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Aug 26, 2008 (4:38 pm)
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Just bought this Impala and first 750 miles with computer average is 22.7 in mixed highway and city driving with plenty of short run ins. This Impala is 3.5 L with 18" wheels and sports tuned suspension. I guess it will increase as this is break in period. Noticed big difference with 18" wheels and tight suspension as it stick to the roads. I wondered if this affects fuel consumption as well.
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- #91 of 117
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Re: 2008 LT 50th Edition [saxe10595]
by nosirrahg
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Aug 26, 2008 (6:33 pm)
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Replying to: saxe10595 (Aug 26, 2008 4:38 pm)
Sticky tires will likely decrease your mileage; also if the diameter of your new wheels & tires is bigger than the factory setup, your speedometer/odometer may be off somewhat and give you a false (lower) reading.
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- #92 of 117
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Re: 2008 LT 50th Edition [nosirrahg]
by saxe10595
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Aug 27, 2008 (7:06 am)
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Replying to: nosirrahg (Aug 26, 2008 6:33 pm)
this is factory installed. Came with 50th anniversary Impala and I guess the speedometer is adjusted from the factory as this was standard on the vehicle. Will post as I drive more about the mileage and alco check between fillups to ensure that computer mileage ie similar.
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- #93 of 117
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Re: 2008 LT 50th Edition [saxe10595]
by cnw
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Aug 27, 2008 (6:10 pm)
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Replying to: saxe10595 (Aug 27, 2008 7:06 am)
saxe--Glad to hear a report from an owner of a 50th Edition. I own a 2006 LT2, and considered trading for a 50th Edition--primarily for the Jewel Tint red and the sport suspension; I've already added the SS-style spoiler  and the wheels/tires are an optional piece at any time. Keep us posted on handling and mileage as you get more miles on it. Clark
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- #94 of 117
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2009 Impala 3.9L LTZ MPG
by hjr3
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Sep 17, 2008 (9:55 am)
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I'm considering a 3.9L 2009 Impala LTZ but I haven't seen too much on what real world drivers are experiencing with the newer (2007-2009) vehicles. Can anyone share their mileage experience in city, mixed and highway (don't forget speeds) for this car equipped with the 3.9L. I'm also curious about your experience and thoughts on Chevy's Active Fuel Management for this engine.
Thanks
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- #95 of 117
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Help With very low gas mileage
by alphacar
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Sep 20, 2008 (3:03 am)
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Hi i have 2001 impala with 3.8 engine and 60 k miles my gas mileage is less than 10 mpg city driving and max 20 mpg in highway 60mph steady speed .I pass emission test with success ,I dont know if there is lack of power because i drive slow ,I change the air filter already i like the car and want to have better mileage .Any help will be appreciated :
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- #96 of 117
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Re: Help With very low gas mileage [alphacar]
by nosirrahg
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Sep 21, 2008 (5:12 pm)
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Replying to: alphacar (Sep 20, 2008 3:03 am)
Wow, that's really bad mileage! The first thing that comes to mind is maybe a clogged catalytic converter, though you'd think that would show up on the emission test. The other thing would be to maybe make sure your transmission is shifting properly; my 2000 was a base model so it didn't have a tach, but if yours has one you might post your RPM when you're cruising at 60 mph and see if anyone else here can compare figures with you. But even without a tach you should be able to note when the transmission shifts, and make sure it's getting into 4th gear properly.
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- #97 of 117
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Bad mileage
by alphacar
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Sep 21, 2008 (8:02 pm)
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Hi nosirrahg Thanks for your answer the emission test was very good and showing very low values regarding the tach in 60 mph is around 1500 rpm ,the gear shifting properly . 
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