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Sedans Chevrolet Cobalt Chevrolet Cobalt Real World MPG
212 messages, Last post on Nov 03, 2008 at 3:49 PM
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I took a 265 mile (each way) trip yesterday and checked gas mileage. The pump failed to shut off automatically when I filled up on the other end of the trip, and a good amount of gas overflowed before I could get back over to the nozzle and shut it off. I was on the other side of the car getting ready to clean the windshield when I heard the splashing noise. The last time I made the same trip, I averaged 33.7 MPG. I did a little experiment as I drove across I 64 in southern Illinois between the Wabash River and Mt. Vernon. I reset the average MPG on the DIC and drove a steady 70 MPG for 15 miles, and the MPG reading was 32.7 at the end of those miles. I reset it again and drove a steady 60 MPH for about ten miles (had to stop at a rest area) and got 37.5 for an average MPG for those miles. Tom
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I have an 08 Cobalt coupe XFE. The car has 4500 miles on it and the mileage has been about the same for me since mile 1. I get about 30 City and 38 Highway. I got 42 on an 90 mile trip but only once. Most of my driving is mixed so I generally get 34 tank to tank. I calculate mileage manually and use the DIC and find that my calculation is ususally within 0.5 mpg but the DIC has displayed as much as 3 mpg lower. Probably due to where I stopped when I fill. Ben
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Replying to: powderkegg (Oct 06, 2008 7:41 am) Your DIC reading is always based on your last hour of driving. So if you did lots of "stop and go" during that last hours it goes down.
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Replying to: grosloup (Oct 06, 2008 9:31 am) Your DIC reading is always based on your last hour of driving. So if you did lots of "stop and go" during that last hours it goes down." I didn't know that! That's good to know, but I would prefer that it just kept averaging from the last time it was reset. Thanks. Tom |
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Replying to: tsjay (Oct 05, 2008 4:26 am) Horsey 
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Replying to: horsey55 (Oct 06, 2008 4:52 pm) You should be a happy camper to be getting that kind of mileage. I have to admit that it was a little hard to believe at first. Tomster |
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Weather has cooled off, so the engine is running cold for a longer time on start-ups. I guess that would explain the slight drop in MPG. Stupid coal trucks! I got behind one this AM on my way to work and heard some fine particles hitting my car. When I got to work and looked at the front end of my car, there were fine particles of wet coal dust. I went to a touchless car wash that probably stripped off the nice coat of wax that I had just put on my Cobalt a couple weeks ago.  I should have known better than to get that close to the back of a coal truck, but I was intending to pass him. It was the two lane road that I travel every day on the way to work. I'll just stay back and not try to pass next time. Tom |
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Very happy with that mileage. This was my usual mix of driving, two lane rural roads with hills, curves, and three stop signs before reaching the town where I work, some miles in town at lunch time, and then the drive back home in the evening. No bumper to bumper city driving, but no interstate cruising, either. Tom |
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I went back up to Illinois yesterday, and this time I only got 32.8 MPG for the round trip. I drove faster than I did last time, so I traded some MPG for some MPH. Also, I should have aired up my tries before the trip, but I waited until today to inflate them to the recommended 30 psi. They were down to 26 or 27 psi cold pressure. The cooler weather caused the tire pressure to go down, and I should have aired up sooner. Proper inflation might have given me a mile or so to the gallon better fuel economy. The onboard air pressure sensors are pretty accurate. They were telling me that I had 26-27 psi tire pressure, and that is exactly what my tire pressure gauge was showing when I aired up this afternoon. Tom |
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How fast does your Cobalt want to run? It seems that every time I let my mind wander a little and stop monitoriog my speed when I am on interstates or parkways, I find that I am doing 80 MPH. I worry about getting a ticket, and, of course, driving 80 MPH doesn't help gas mileage. These little Cobalts sure like go fast, don't they? Anyone have any recommendations for brands of aftermarket cruise control, or for where to have it installed? How much should I plan on spending? Thanks. Tom
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