According to the National Highway Traffic Safety Administration about 30% of all vehicles had at least one tire that was 8psi or more under-inflated. About 5% had all four tires seriously under-inflated. The same survey showed that only 4% of respondents checked tire pressure as part of their routine maintenance. That would seem to say that most cars had one or more tires that needed some air.
Under-inflated tires can cut fuel economy by 2% per pound. So if your tires should be at 32psi and they're actually at 27psi, you've reduced your mileage by 10%. In case you were wondering, you'll find the recommended level on the tire itself, in your owner's manual, or on a door jamb tag.
Checking your tires takes only a few minutes and no particular skill. A tire gauge costs less than $5. Air is available at your gas station and most stations still offer it free of charge. Get in the habit of checking tires once-a-month.
So if gasoline is $2.00 per gallon, just by inflating your tires, you could reduce your “real” price to $1.80 per gallon.
Let's see what else you can do to reduce gasoline costs. The old fashioned tune-up is a thing of the past. But that doesn't mean that you can ignore engine maintenance. Check your owner's manual to see when maintenance needs to be performed. For instance, a blocked air filter can reduce your gas mileage by 10%.
Increased friction decreases gas mileage. Using the wrong grade of oil or not changing it frequently enough increases friction. Check your manual for recommended grades and change intervals.
If your owner's manual doesn't call for premium gas, don't buy it. You will not improve your performance or gas mileage. About 10% of us buy premium gas when it is not needed.
Reduce Excess Weight
Remove excess weight from the car. Your trunk or van is not a storage area on wheels. Unless you plan on needing it this trip take it out of your trunk. Naturally emergency equipment is the exception. An extra 200 pounds will cost you one mile per gallon. That's about a 4% reduction in mileage.
Most of the other gas-saving ideas are pretty widely known so we'll just mention them as a reminder.
Air Conditioner Use
Your auto air conditioner reduces mileage by 10 to 20%. In winter we think of the “wind chill.” Open vents in a moving car create the exact same effect.
Speed
Increasing your highway speed also increases your gas consumption. So does fast getaways from traffic lights.
Idling
Sitting in traffic wastes gas. You may find that leaving for work earlier helps you avoid jams. Instead of reading the paper at home before leaving for work, take it with you and look at it after you've arrived.
Gas Saving Fluids
A word about some of those devices that claim to double your gas mileage. The Environmental Protection Agency has tested over 100 gas saving devices and found that, at best, they don't help any more than good maintenance does. The EPA says that they have not endorsed any product.
It’s all Relative
Finally a couple of thoughts about the “gas crisis.” Yes, it's frustrating, but let's keep it in perspective. If you take inflation into account, today's gas prices are about the same as they were in 1986. According to the U.S. Dept. of Energy “real” gas prices are much lower than they were at their peak in 1981. The $1.40 that we paid in 1980 would be $3.18 today if adjusted for inflation.
We're not without options. We've just shown that even individuals can take steps to control what they spend on gas.
Gary Foreman is a former purchasing manager who currently edits The Dollar Stretcher Web site -http://www.stretcher.com.
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