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Chevrolet Impala Real World MPG

117 messages,  Last post on Apr 15, 2009 at 11:28 AM

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What is this discussion about? Chevrolet Impala, Fuel Efficiency (MPG), Sedan

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#97 of 117 Bad mileage by alphacar Sep 21, 2008 (8:02 pm)
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 .
#98 of 117 '04 Impala LS by gar_fanatic Oct 31, 2008 (8:54 am)
I've had my car for 3 years now. Bought it with 20,000 mi, now have 112,000. When I bought it, I was consistantly getting 27 commuting to work (mostly rural highway, no freeway). It never used to matter if the A/C was on or not or how I drove, it was always 27. Now I'm down to 24 mpg since last winter. We did get 31-32 coming back from Tennessee to Iowa 2 years ago, which is the best ever. We've changed plugs, wires, fuel filter, cleaned fuel injectors, air filters, cleaned throttle plates, cleaned mass air flow sensor, coolant flush, semi-synthetic oil (every time), thermostat, transmission flush, among other things, trying to get our fuel mileage back. It's just not working. Anyone have any more ideas? Overall, I like the vehicle. It's really comfortable going down the road and has a great sporty feel to it.
#99 of 117 Re: MPG on 2003-04 Impala ? [michel4] by road46 Nov 06, 2008 (7:42 pm)
Replying to: michel4 (Jul 21, 2005 7:14 pm) I have a 04 Impala with the 3.4 engine. I now have about 44400 miles on this car and the highest mpg that I have obtained was 36.6 mpg driving from PA to VA. This was done by driving at about 60 mph with the air conditioner on the lowest setting, windows up. The best "average" highway mpg is around 32 mpg. I average about 22-25 mpg around town with a little bit of highway driving. You can also go to "True Delta. com and see real mpg figures reported by owners. If you are considering one of these cars they are reliable, safe vehicles and can be obtained at a good price used. I would try to get the latest model as I could afford. Hope this helps.
#100 of 117 Re: 2008 LT 50th Edition [saxe10595] by ryster Nov 07, 2008 (12:45 am)
Replying to: saxe10595 (Aug 26, 2008 4:38 pm) "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..."   My '06 Impala 2LT with the 3.5L has averaged about the same mileage as yours since when it was new. I now have about 33,000 miles on it and the mileage remains in the 21-22mpg range in mixed driving. Pure city driving nets about 19mpg, all highway driving 27-28mpg.
#101 of 117 Re: 2008 LT 50th Edition [cnw] by ryster Nov 07, 2008 (1:02 am)
Replying to: cnw (Aug 27, 2008 6:10 pm) "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."   Adding the '06+ SS style 18" wheels to a non-SS '06 or '07 Impala is not a simple bolt on. The front would be a direct swap, but the rear strut mount plates are different between the LS/LT/LTZ models from the '06 and '07 model years and the SS models. To do the swap on '06's and '07's, you would also need to get the SS rear strut pieces installed...otherwise the SS wheels will rub on the back.   In the '08 model year, LTZ, SS, and the 50th anniv. models have the sport suspension as standard which allows them to run the 18" wheels unobstructed.   Adding the '06/'07 17" alloys from an LTZ to an LS or LT model would be a simple swap. The SS wheels, not so much. I looked into it myself, and talked to thers who had done it, and determined it to be too expensive. The 18" wheels/tires themselves would be inexpensive enough on eBay, but getting the rear suspension swapped out was going to easily add another $300 in parts and labor to the project. Replies to this message: cnw (Nov 07, 2008 3:30 pm)
#102 of 117 Re: 2008 LT 50th Edition [ryster] by cnw Nov 07, 2008 (3:30 pm)
Replying to: ryster (Nov 07, 2008 1:02 am) Ryan, Thanks for the info. You answered several questions that I have had. I didn't realize that it was that involved; thought it was just a matter of changing wheels and tires. That also answers some of the questions I've had regarding what the difference in suspension is between models. I guess I'll just wait until I buy my next one and make sure I get the sport suspension. Thanks again, Clark
#103 of 117 Had a 2007, now a 2009 Impala LT by hawkman Feb 11, 2009 (7:12 am)
I just traded my 2007 LT for a 2009 LT because of the traction and ABS. This may be too early to tell but my gas mileage seems have decreased from 24 with the 2007 to 20 (2009) in normal driving with the same engine size.   This could be due to 2 main factors 1) This is a new car with less than 1500 miles on it presently 2) I am driving in the winter vrs the summer. I'll be taking on a 1200 mile trip this weekend to check the highway mpg.   I would like to hear from drivers with the 2009 to compare and see what mpg they are getting. I miss my 24 (although it was in the summer).   I know cars get worse mileage in the winter for a variety of reasons, but does the car get better meileage as it gets older and more broken in? Replies to this message: rvoth (Feb 12, 2009 9:57 am)
#104 of 117 Re: Had a 2007, now a 2009 Impala LT [hawkman] by rvoth Feb 12, 2009 (9:57 am)
Replying to: hawkman (Feb 11, 2009 7:12 am) Just a friendly reminder that you shouldn't just lock the car on cruise and let it go.   The engine should have varying speeds, so the engine parts can heat up and break in under normal hwy speed and then cool at slower at slower hwy. This should be done with the time intervals 15 min normal and 15 min at slower speed. It will greatly help the fuel mileage and overall performance of the life of the engine.     My father just purchased a SS impala , it went on a 3000 km trip and the fuel mileage was 24-27 mpg. They just went on a 500 km trip on flat land and the mileage went up to 32 mpg. This improvement is probable due to the previous trip through the mountain ,varying the speeds and allowing the V-8 engine to break in.    Still the fuel mileage hasn't reach the rated 37 mpg but it only has 4000 km and is being driven in winter. Even with the fuel management system that works very well GM's mpg for the v-8 is hard to reach.
#105 of 117 mileage by saxe10595 Feb 28, 2009 (4:57 am)
2008 LT 50th edition. Now I have about 10k mileage. Computer shows average mileage to be 21.4. I get 26-27 on highway and 18-20 in the city. It has 18" wheels could this be cause of low mileage ? as GM claims anywhere upto 29 MPG. Replies to this message: quietpro (Feb 28, 2009 7:18 am)
#106 of 117 Re: mileage [saxe10595] by quietpro Feb 28, 2009 (7:18 am)
Replying to: saxe10595 (Feb 28, 2009 4:57 am) Lots of things can cause mileage to vary. The EPA estimates are achieved at 60 mph I believe. Try setting your cruise at reasonable speed, reset the mpg average, and see what you get. It won't take a long trip to get a close approximation of mileage. Try it in both directions to help rule out any slope in the trip or head wind. I can average above the EPA estimate at 65 mph with my SS (5.3L V-8).   BTW, the wheel size shouldn't have a great effect in highway mileage. The biggest impact of wheel size would be in city mileage where the added weight would effect fuel consumption. The effect while cruising would be minimized.

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