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Sedans Chevrolet Cobalt Chevrolet Cobalt Real World MPG
295 messages, Last post on Nov 23, 2009 at 4:23 PM
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Replying to: pa356228 (Apr 21, 2009 12:19 am) Like you already know you should check your tire pressure when tires are cold or when you didn't move your car for a couple of hour. If you do lots of highway driving your p.s.i. will increase by itself by a couple of ponds, faster in summer or hot pavement. If you want my advice let them at 30 p.s.i. an over inflated tire is as bad as a under inflated one. Eventually you will see that your tires will get worned-out prematurally. |
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Replying to: pa356228 (Apr 21, 2009 12:19 am) The only filter that needs to be changed is the oil filter. The air filter and cabin air filter get changed at longer intervals.
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Replying to: steve333 (Apr 21, 2009 12:53 pm) Anyways, having you car in line (aliments) will make a big difference on your gas mileage and tires also. |
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32 psi is considered overinflating? Not by me! What are the PSI recommendations listed on the doorframe? I prefer 34 psi for my vehicles, and 34 is within the range specified on the doorframe for max-speed or max-load operation.
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Oil Change places always go for the replace PCV valve line, but you notice your dealer will never recommend it. It isn't necessary. As for the tires, the door jam says 30, my dealer and Discount Tire always puts them on 35 but I prefer to keep them on 32. |
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Replying to: elias (Apr 22, 2009 3:41 am) I also own a 2005 Equinox this one is 35 p.s.i. and for my show car... a 1977 Chevelle Malibu Classic the door frame p.s.i. requirements are at 24 p.s.i. If I take your example of 32 p.s.i. well for my Equinox it would by "under inflated" but for my Chevelle it would be well "overinfalted". Don't go by what's written on the tire (like most people do) that's the max-speed and max-load operation of the tire. Always go by the car's door frame recommendations. By the way...you didn't mention what type of car you drive. |
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My doorframe says 30 psi but the tires says never to exceed 40 psi. Strange world. Guess we will never know. Funny how the world works, but my advice I can give is just go what best suits you. My uncle is a mechanic, for his cars he always put 32 psi in all his tires and even with my cars. He never had problems with 32. Today, I set all my tires at 30 psi, according to the doorframe and see how well that goes for gas mileage and tires for a week or two. Also, some tire shops, have hydrogen tires which they said will also increase gas improvements and last longer than original tires. Also, I drive a 2006 Chevy Colbalt LS (4-doors sedan) now with 51,303 miles. I will take my car in for an oil change on tuesday and going on a long trip on wednesday VB,VA to Pittsburgh, PA (450 miles or 8 hrs) and will calculate m/g/mph to accurate mpg. I'll post results.
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Replying to: pa356228 (Apr 23, 2009 10:58 pm) The same tires are used on different vehicles, and the max pressure indicated on the tire itself is not indicative of where the pressure should be run on a particular vehicle; it just means that that pressure should not be exceeded. The optimum air pressure is very much related to the vehicle weight. For lighter vehicles, less air pressure is needed, and for heavier vehicles, higher air pressure is needed. What you are looking for is a good "footprint." You want the tread all the way across the tire to be in contact with the road. Over-inflation makes only the tread in the middle of the tire make contact with the road and will cause the tread to wear more in the middle. Low air pressure will make the inside and outside tread make more contact with the road, and the edges will wear out faster. Some people actually rub chalk across the tread, drive a few feet, and then check the footprint the chalk made. Not too many people go to that much trouble. Just stick with the manufacturer's recommendation, and you should be OK. Tom |
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That is a good way to look at things, meaning that the companies who make these cars suggest putting a sticker of tire pressure psi on the doorframe, why not use it? If we didn't, why would the company waste time and money on something that we won't bother with. Most people who cares about their vehicles would love to get most out of their money. Everyone should do the same, especially when the economy is bad and will only get worst. Of course, some people don't care that much about their vehicle and would rather buy tires if they absolutely have to. (to pass state inspections) Why would spend extra money for lazyness. Never really give enough thought about it, until now. Thanks Tom. |
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I've done the tire-chalk test in years past, with a Z28... I like it when street cars wear the tires perfectly flat like my 5 3rd, 4th gen f-body/Z28 cars always did. currently I drive an 06 VW jetta, and an 05 Pontiac GTO, both manual shift. The VW wears the tires nice & flat. GTO not so. Anyway, I really like the blue cobalts and would consider one at some point (with manual shifter of course). i'd bet that cobalts wear the tires nice & evenly, if you select the right PSI and only participate in drifting exhibitions every *other* weekend. |
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