Crystal Lake and Barrington Auto Repair

How low is too low in your gas tank?

Q. I enjoy reading your column in the Daily Herald and have a question. You mentioned that letting the gas level get too low can result in damage to the fuel pump. My question is: How low is too low?

I usually don't let the level drop below one-eighth of a tank just to ensure that I don't run out. Is that a sufficient safety factor?


A. Thanks for reading the column and taking time to write. I love getting questions from drivers like you who are interested in taking good care of their cars.

You are probably OK at one-eighth of a tank but I would start thinking about getting gas when the gauge reads one-quarter tank; this way if you don't get to the gas station right away, there is a good chance you won't go below one-eighth. Additionally, if you get caught in a traffic jam and one-eighth of a tank is not enough, you could run out.

And don't wait until the next day; the price might go up like it did recently when I waited until it was more convenient in the afternoon. It seemed like the price went up about 30 cents per gallon.

I also recommend a Top Tier fuel. You can go to to find all the gas stations that sell Top Tier fuels.

Only use the octane rating your car calls for. If your car calls for 87, you won't gain anything by using 93 octane fuel, but if your car calls for 93 and you use 87, it will run, but you will sacrifice performance and fuel economy, which may offset the difference in cost.

Fuel-saving tip: Last week we talked about tire pressure. In keeping with that theme, this week I would like to suggest that having worn steering linkage or a car that is out of alignment could affect your fuel economy, as well.

If you think about it, if you have a tire that is not aligned properly, there will be more friction with the road and you will use more energy to get it moving down the road and, consequently, you'll use more gas.

Sometimes you can tell your car is out of alignment by the way it drives; it may pull to one side or the other. Even if your car seems to drive straight it is still a good idea to have the alignment checked at least yearly. It can be out of alignment and still drive straight. One good lick from a pothole is enough to knock things out of alignment. By getting things trued up you will not only save gas but you will get more life out of your tires.

Between keeping your tire pressure correct and having proper wheel alignment, you could save quite a bit in gasoline costs.




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