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Well, of course it's possible to use those things. The odds of it actually doing any good are pretty slim. It probably comes with some instructions saying you need to accellerate slowly and stop gently. If you follow these instructions, you will probably get better mileage even without the "thing", and if you don't follow them, the manufacturer will say that's why you didn't see any improvement.

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โˆ™ 2004-06-04 00:00:00
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Q: Is it possible for you to use one of those things that claim to increase MPG by like 30 percent by attaching something a particular hose or by placing magnets on the gas tank?
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