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Sedans Chevrolet Impala Chevrolet Impala Real World MPG
117 messages, Last post on Apr 15, 2009 at 11:28 AM
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Replying to: cnw (Aug 27, 2008 6:10 pm) 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.
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Replying to: ryster (Nov 07, 2008 1:02 am) |
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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? 
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Replying to: hawkman (Feb 11, 2009 7:12 am) 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. |
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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.
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Replying to: saxe10595 (Feb 28, 2009 4:57 am) 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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Replying to: pulgo (Nov 28, 2007 8:12 am) I've found this to be true on a 2009 Impala LS. It says I got 25.3 mpg, but upon checking (miles vrs gas used) it comes out to 22.9. That too me is a huge difference. This is the second fill up in a row I have tested it and they both came back the same - way off.
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Replying to: hawkman (Mar 28, 2009 2:28 pm) I have tracked my mileage since I bought my car over three years ago. I am always within a 1 or 2 mpg from the indicated amount...but less than 1 mpg difference 95% of the time. The computer in my car is extremely accurate and given the variances that I am forced to deal with, it may be more accurate than I am capable of being. |
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Replying to: hawkman (Mar 28, 2009 2:28 pm) I have found when filling up that regardless of what gas station I use, the pump shuts off about 2 gallons early. Meaning, I can usually put 2 more gallons in after the pump first shuts off. |
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 My 01 Imp LS mileage has dropped from the early 28-32 mpg to 22-24 mpg now at 255,000 miles. Otherwise the car looks and drives great. I have been completely satisfied with this car. The only non routine work on this car has been replacing cat twice, one wheel sensor, one coolant level sensor, the radiator and then the motor mounts at 225,000 miles. The fuel gauge hasn't worked since 110,000 miles, but I got used to tracking the miles on the trip odometer. I use Mobil 1 at 3,000-5,000 change intervals, do the transmission flushes and fuel system cleaners as recommended and that's about it. Oh and the last set of Michelins on this car went 114,000 miles. GM does build good cars!
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