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Chevrolet Cobalt Real World MPG

293 messages,  Last post on Oct 29, 2009 at 5:42 PM

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

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#249 of 293 Re: Real Mileage [boodrow] by powderkegg Feb 17, 2009 (6:03 pm)
Replying to: boodrow (Feb 17, 2009 2:11 pm) I always calculate my own milage... that's something we were taught how to do when I was in math class way back in elementary school.... the computer always reflects differently (usually lower) than what I get.   Your skeptical demeanor is a little on the side of I don't like how you're talking to me. If that's not what you meant, that's fine no foul. Don't assume that everyone on here is an idiot.
#250 of 293 Re: First Highway mileage [Amunhotep] by Amunhotep Apr 13, 2009 (7:30 am)
Replying to: Amunhotep (Dec 28, 2008 12:19 pm) I now have about 4700 miles on the Cobalt and have seen little improvement in mileage. I have been averaging around 24 in mixed highway/city driving. I just returned from a long highway trip, around 400 miles in 98% highway and got 29 mpg (not computer average but miles divided by gallons). Still a little disappointing, but the car rides well, quiet and steady. I am beginning to think that the larger tires (16" w/ machine face aluminum wheels) may have something to do with the mileage. I use a light foot for acceleration, use the cruise control most of the time and watch my braking. I hope that improvement may come in the near future.
#251 of 293 Re: Where's my 37 MPG? [timb24] by timb24 Apr 13, 2009 (4:55 pm)
Replying to: timb24 (Feb 07, 2009 6:40 am) Update to my previous post - I now have 3300 miles, and have seen improvement. I took your idea powderkegg and switched fuel type, and saw an immediate improvement. It's also warming up around here (North Central PA), so I'm not wasting as much fuel warming up the car. Same mix of driving mostly highway, and I'm getting in the 33-36 MPG range. All around, love the car. I got what I expected. Replies to this message: malexbu (Apr 13, 2009 5:38 pm) powderkegg (Apr 14, 2009 5:45 pm) timb24 (Apr 15, 2009 4:52 am) poncho167 (Apr 17, 2009 7:26 am) malexbu (Apr 17, 2009 3:42 pm)
#252 of 293 Re: Where's my 37 MPG? [timb24] by malexbu Apr 13, 2009 (5:38 pm)
Replying to: timb24 (Apr 13, 2009 4:55 pm) switched fuel type, and saw an immediate improvement   Can you clarify this? I've been diligently monitoring MPG in my cars for years but could never correlate the results with the gas brand used. I prefer Shell, then perhaps Mobil/Exxon, then perhaps Sunoco, but this is all very non-scientific.   Due you have any data demonstrating a certain gas brand's advantage? Replies to this message: powderkegg (Apr 14, 2009 5:45 pm) timb24 (Apr 15, 2009 4:52 am) poncho167 (Apr 17, 2009 7:26 am) malexbu (Apr 17, 2009 3:42 pm)
#253 of 293 Re: Where's my 37 MPG? [malexbu] by powderkegg Apr 14, 2009 (5:45 pm)
Replying to: malexbu (Apr 13, 2009 5:38 pm) Here is the information from the post that outlines my "experiment." No scientific data, just trial and error and a little advice from fueling experts.   I've read in other parts of this forum and other magazines that short shifting and under-accelerating will negatively impact your gas milage. I have an 08 cobalt xfe and have gotten 42 mpg during my trip. That including resetting the DIC when I fueled the vehicle and about 5 miles of non interstate driving before I entered the interstate. I don't get that all the time, but it just shows that it is possible.    Another interesting bit of information and take it for what it is worth. I always use sunoco gasoline. I am a firefighter at an airport (Harrisburg International, PA) and happened to be having a conversation with the manager of the aircraft fueling station. We were talking about fuel prices and etc and he stated without prompting that Sunoco fuel is the best fuel on the market. They are not affiliated with any brand of fuel. He took me down and showed me samples from thier fuel tanks; some was Sunoco and some was not. The Sunoco fuel looked almost clear, just like real good moonshine! Anyhow, I've been running a little bit of a test. I switch the fuel in my girlfriends car from time to time. She is not as particular with her fuel (she get's whatever is cheaper). I will fill her tank and not tell her where I got the fuel so she doesn't alter her driving. The Sunoco tanks always always always get 3 to 4 miles a gallon better than any other fuel. Try it out and see what happens. It may impact your oil life as well. I've got over 8000 on my current oil change (12200 miles total on the car: 08 Cobalt LS XFE) and the DIC oil life says 27%. Clean fuel, clean oil....... let me know if you get different results.   Just an update to my milage results. Now that the weather has been warmer I have been getting no less than 36.3 mpg (combined driving) calculated as I fill the tank and not calculated by the car DIC. I drive the posted speed limit and try not to accelerate too heavily so I am not driving like Grandma.
#254 of 293 Re: Where's my 37 MPG? [malexbu] by timb24 Apr 15, 2009 (4:52 am)
Replying to: malexbu (Apr 13, 2009 5:38 pm) I saw my improvement when I switched from an local convenience store which doesn't even advertise their gasoline brand (yea, i know...i went for the cheaper price) to Citgo gasoline.
#255 of 293 Got 34 mpg, '09 Cobalt automatic, SF to LA by micweb Apr 16, 2009 (1:36 pm)
Got 34 mpg, '09 Cobalt automatic, SF to LA.   Usually commute mileage is around 29-30.
#256 of 293 Re: Where's my 37 MPG? [malexbu] by poncho167 Apr 17, 2009 (7:26 am)
Replying to: malexbu (Apr 13, 2009 5:38 pm) Don't have data but it is well known that the quality of a brands gas can be as much as 2-3 mpg/ Replies to this message: malexbu (Apr 17, 2009 3:42 pm)
#257 of 293 Re: Where's my 37 MPG? [poncho167] by malexbu Apr 17, 2009 (3:42 pm)
Replying to: poncho167 (Apr 17, 2009 7:26 am) How would you explain that? If they get gasoline from the same refinery, which is quite likely   I mean no disrespect but I've seen not a single piece of data to support the claim that it is well known that the quality of a brands gas can be as much as 2-3 mpg.   Different brand differ primarily, as far as I understand, in the composition of the fuel detergent added. This may have effect on the engine's health, long term, but it's not easy to change the amount of energy a gallon of gasoline produces.   I do prefer to use a brand gas (will use no-name only rarely), but this is purely for the detergent.   Would love to see the data showing the MPG advantage of a brand name.   "Well known 2-3 mpg"... People refer to each other's words and an urban legend gets born. I could believe 1/2 mpg difference, but 3?.. Let somebody show the data, not perceptions.   I watch my MPG like a hawk -- and here is my data: on a trip from TN to MA, I filled up at three gas stations: Shell, Sheetz, Citgo. The MPG (calculated as "the distance to the volume") for the three legs fueled by each was as follows:      Shell - 36.8, Sheetz - 38.9, Citgo - 36.3.   (This is for a 2005 Malibu with Ecotec 2.2L.)   It's either Sheetz is brandier than the rest or... well, something else.
#258 of 293 I'm new to this forum. I have a 06 Cobalt LS Auto. by pa356228 Apr 19, 2009 (9:48 pm)
My Cobalt LS (4-door sedan) auto gets about 27 mpg average (mostly city driving) and gets about 31-34 mpg on hwy. I usually keep my tires at 32 psi as my door panel says 30 psi, is that bad for my tires. How can I get more mpg out of my car? Did change the spark plugs 3 weeks ago, and actually gave my car 1 mpg more when I start the engine. Replies to this message: steve333 (Apr 20, 2009 6:47 am) laserblue (Apr 20, 2009 8:58 am)

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