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If you've ever run out of gasoline, you know you'd gladly pay just about any price to get to the nearest gas station. Now come two brands of "sort-of" fuel that can keep you from getting stranded on the road. If you're not careful, however, they can cause even bigger problems.
Pennzoil's version, called Rescue, costs $20 for a half-gallon jug, which will take you up to 10 miles (800 248-6688; www.pennzoil.com). There's also Spare Tank from Emergency Solutions (877 772-7382; www.sparetank.com). You get a gallon for $20, which will take you as far as you'd go with a gallon of gas. Both come in plastic containers you can safely store in your trunk.
But there's a tradeoff for the peace of mind these gas substitutes can bestow, and the manufacturers note this. That is, you have to use them up or dilute them with gas while the car's engine is still warm. ...