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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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#64 of 117 Re: 2007 Impala SS Mpg [slvimpala] by pulgo Jul 30, 2007 (7:04 am)
Replying to: slvimpala (Jul 29, 2007 10:22 pm) The "tornado" thing is just a scam. Replies to this message: nosirrahg (Jul 30, 2007 7:56 am)
#65 of 117 Re: 2007 Impala SS Mpg [pulgo] by nosirrahg Jul 30, 2007 (7:56 am)
Replying to: pulgo (Jul 30, 2007 7:04 am) I also made the mistake of purchasing a set of "halo" spark plugs that were supposed to increase gas mileage 10%. After initially installing them on my 2000 Impala I started having problems with the car missing when lugging the engine (as in going uphill at low speeds with the AC on, just before the car would downshift). I subsequently replaced the plug wires (which I had not done previously), and in the process found the shafts on several of the plugs that the wires snap onto were loose (they sort of thread onto the ceramic portion of the plugs).   So the combination of tightening the plug shafts and replacing the wires solved the problem...for about a month. The problem surfaced again yesterday, so I'll drive it for a little while to see if it consistent, and then pull the plug wires and see if those shafts had worked loose again, or if there's something else going on. While beyond that these spark plugs seem to work okay, they've had no impact on my gas mileage at all (positively or negatively). I would have expected an increase had I replaced them originally with standard plugs, so I was disappointed that I saw no increase with the new plugs.   If I find the shafts are loose again I'll tighten them again, but if the problem continues to come up I'm yanking them out and will probably put a set of Bosch plugs in there and not worry about it again.
#66 of 117 2006 Impala w/3.5 @ 37,800K Miles by joeboston Aug 13, 2007 (9:19 am)
I just started driving this car to work everyday. It was my wifes car but she now drives the SAAB 95. My plan is to start documenting the MPG as I try different ideas to improve it.   So far I have only adjusted the tire pressure to 44 psi (This is the max for the stock tires). My daily drive is from Ortonville, Mi to Detroit, MI (RenCen). This takes me on county roads and I75 (Parking lot).   I am just starting the log which I will base all of my future results on. The results to date are using the on board computer.   Drove from Ortonville, Mi to Frankenmuth, MI., I75 with the cruise set on 72 MPH with the A/C on. We had 2 adults and one 4 year old in the car. We averaged 36 MPG on the way there and 33 MPG on the way back (Ran into construction backups on a Sunday afternoon heading south).   The week of 7 August driving to work and back home averaged 26 MPG. This was combined county Road driving and I75 (Rush hour traffic).   Today (13 Aug 07) I drove in at 8 AM (Much less traffic). I reset the on board computer after entering I75 (Great Lakes Crossing Exit). Set the cruise on 74 MPH, without A/C and one adult in the car. The traffic was so light I was able to maintain a constant speed all the way downtown. As I exited I75 onto I375 (detroit) the on board computer indicated 40.4 MPG.   Future improvements: Replacing the stock air filter with a new K&N filter. On order, waiting for delivery. On the next oil change I will be using Mobile Full Sytn 5-30 Replacing the spark plugs with Bosch Iridium Fusion plugs. Replacing the stock tires with ones that can hadle at least 45 PSI.   I plan to do each one on seperate tanks of gas and measure the entire tank along with the on board computer for results.   I am very interested in your comments and suggestions. I have played around with small onboard hydrogen units in the past with good results. This unit may find a place in this effort as well.   Thanks Joe Replies to this message: pulgo (Aug 13, 2007 9:37 am) quietpro (Aug 15, 2007 6:39 pm)
#67 of 117 Re: 2006 Impala w/3.5 @ 37,800K Miles [joeboston] by pulgo Aug 13, 2007 (9:37 am)
Replying to: joeboston (Aug 13, 2007 9:19 am) To measure your gas consumption I would not rely on the computer.   Just fill up, reset the trip meter to zero.   Next time, do the same again and divide the gallons printed on your receipt by the miles shown on the trip meter. Reset trip meter.   Repeat this procedure for at least 3 tankfuls and you will have a fairly accurate MPG figure. Replies to this message: quietpro (Aug 15, 2007 6:39 pm)
#68 of 117 Re: 2006 Impala w/3.5 @ 37,800K Miles [pulgo] by quietpro Aug 15, 2007 (6:39 pm)
Replying to: pulgo (Aug 13, 2007 9:37 am) If you want to be sure of your consistency, fill up at the same station using the same pump to eliminate calibration errors at the pump. There have been many reports (at least in my area) of pumps that have been intentionally tampered with to overstate the amount of fuel pumped.
#70 of 117 MPG 2007 Impala LTZ - Very Good by level Sep 02, 2007 (4:36 am)
City driving in Atlanta:    I consistently got 23.9-24.1 MPG during winter.    During summer with a/c consistently get 23.2-23.3 MPG.    Better on hwy, add 2.0 MPG to winter and summer city average.    This is very good to me. What do you get?
#71 of 117 Re: Chevrolet Impala Owners: MPG-Real World Numbers [KarenS] by steve333 Oct 27, 2007 (7:25 pm)
Replying to: KarenS (Jun 02, 2005 11:20 am) 2006 Chevy Impala with 3.5L V6 14.5 MPG city driving. Might as well be driving a truck. Replies to this message: quietpro (Oct 28, 2007 2:19 pm) thegraduate (Oct 29, 2007 12:48 pm)
#72 of 117 Re: Chevrolet Impala Owners: MPG-Real World Numbers [steve333] by quietpro Oct 28, 2007 (2:19 pm)
Replying to: steve333 (Oct 27, 2007 7:25 pm) Sounds like you left the parking brake engaged. Seriously, though, you must have some serious issues unless maybe you're using the trip computer and have never reset it for a fresh reading. Another poster was having terrible averages and I believe it turned out that she had never reset her trip computer. Is that a possibility? Replies to this message: thegraduate (Oct 29, 2007 12:48 pm)
#73 of 117 Re: Chevrolet Impala Owners: MPG-Real World Numbers [quietpro] by thegraduate Oct 29, 2007 (12:48 pm)
Replying to: quietpro (Oct 28, 2007 2:19 pm) Depending on the ratio of "stop" to "go" that mileage may be accurate. Very short trips, and lots of idling time really knock mileage down.   Tell me steve, what kind of mileage did you get in previous vehicles in the same conditions/average speed?

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