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Chevrolet Impala Real World MPG

117 messages,  Last post on Apr 15, 2009 at 12:28 PM

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

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#108 of 117 Re: 2006 Impala SS [hawkman] by quietpro Mar 29, 2009 (8:08 am)
Replying to: hawkman (Mar 28, 2009 3:28 pm) When comparing mileage (actual vs. computer), keep in mind that you are attempting to fill the tank to the EXACT same level for an accurate comparison. If you stop the pump at an even dollar (like most people), you may be topping off with varying amounts each time. If you stop when the pump cuts off, that will vary by the fuel nozzle and how far it is inserted into the filler tube. Even 1/4 gallon will skew the results a great deal. Add to that the calibration of the pump at the gas station you're using. While they are regulated, there are still many cases where pumps are intentionally set to deliver less fuel than is indicated. Even different pumps at the same gas station can skew your results.   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.
#109 of 117 Re: 2006 Impala SS [hawkman] by ryster Mar 29, 2009 (11:11 am)
Replying to: hawkman (Mar 28, 2009 3:28 pm) The Driver Information Center ("DIC") in my '06 Impala 2LT is very accurate. Usually no more than 1mpg off from what I calculate manually. In fact, it is accurate enough that I can look at the calculated miles to empty before filling up and estimate how much gas the car will take (for example, if the DIC says the range is 66 miles, and the DIC shows economy of 22mpg, the car will take 14 gallons.) It is usually right on and fills to the point where gas almost overflows.   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.
#110 of 117 '01 IMP LS 3.8 255,000 miles 22-24mpg by txguy Apr 14, 2009 (11:41 am)
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! Replies to this message: highmiler650 (Apr 14, 2009 11:54 am) txguy (Apr 14, 2009 11:59 am) highmiler650 (Apr 15, 2009 8:14 am)
#111 of 117 Re: '01 IMP LS 3.8 255,000 miles 22-24mpg [txguy] by highmiler650 Apr 14, 2009 (11:54 am)
Replying to: txguy (Apr 14, 2009 11:41 am) How about changing the fuel injectors? This might restore some of the lost MPG. Replies to this message: txguy (Apr 14, 2009 11:59 am) highmiler650 (Apr 15, 2009 8:14 am)
#112 of 117 Re: '01 IMP LS 3.8 255,000 miles 22-24mpg [highmiler650] by txguy Apr 14, 2009 (11:59 am)
Replying to: highmiler650 (Apr 14, 2009 11:54 am) I never even considered changing out the injectors. Good idea. I keep thinking I am going to trade it in, but then I haven't found anything I like better.. and of course, this one is paid for. Oh and I might change out the plugs too. This is only the second set for the car. They are such a pain to change. Replies to this message: highmiler650 (Apr 15, 2009 8:14 am)
#113 of 117 Re: '01 IMP LS 3.8 255,000 miles 22-24mpg [txguy] by highmiler650 Apr 15, 2009 (8:14 am)
Replying to: txguy (Apr 14, 2009 11:59 am) Although many cars have spark plugs that may last up to 100k miles I believe in changing them every 3 years or 60k miles at most.   The reason is that although they might survive much longer periods working as intended, they are notoriously difficult to remove after many years.   Even when installed properly with a bit of anti seize compound they are a pain to remove without causing damage.   I always get new plugs at around $ 2 per plug (platinum) so the investment is really not much.   Lastly, your car is paid for and anything requiring fixing is going to be much cheaper than 3 to 5 years of monthly payments, especially in these tough times.
#114 of 117 Re: '01 IMP LS 3.8 255,000 miles 22-24mpg by gar_fanatic Apr 15, 2009 (8:57 am)
Wow, where are you finding platinum plugs for only $2.00 per plug?!?! The cheapest I can find Delco ones is $6.00 per plug. I won't put anything else in my 'Pala.   At 255k, have you had to replace your upper intake manifold yet? Replies to this message: txguy (Apr 15, 2009 9:13 am) highmiler650 (Apr 15, 2009 12:28 pm) highmiler650 (Apr 15, 2009 12:27 pm)
#115 of 117 Re: '01 IMP LS 3.8 255,000 miles 22-24mpg [gar_fanatic] by txguy Apr 15, 2009 (9:13 am)
Replying to: gar_fanatic (Apr 15, 2009 8:57 am) replaced intake manifold at 50K or so. I also use only plugs that the car is designed around, Delco. Replies to this message: highmiler650 (Apr 15, 2009 12:28 pm)
#116 of 117 Re: '01 IMP LS 3.8 255,000 miles 22-24mpg [gar_fanatic] by highmiler650 Apr 15, 2009 (12:27 pm)
Replying to: gar_fanatic (Apr 15, 2009 8:57 am) Schucks usually has them discounted to this price on one of their flyers (state of Washington, Bellingham area).
#117 of 117 Re: '01 IMP LS 3.8 255,000 miles 22-24mpg [txguy] by highmiler650 Apr 15, 2009 (12:28 pm)
Replying to: txguy (Apr 15, 2009 9:13 am) The car will run fine on any brand as long as they are equivalent to the Delco you mention (Bosch, Champion or any other well known brand)

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