Characteristics: Bismuth is a brittle, silvery-green metal that has a low melting temperature and high specific gravity. Being both stable and non-toxic, bismuth is often used as a replacement for toxic metals such as antimony, cadmium, lead and mercury.
1 (Minimums vary by location and tank size, and can range from 100-1,500 gallons.) More often, the propane company charges a fee of anywhere from $25-$250 a year but averaging around $75-$130 annually, depending on local rates, the size of the tank and whether it's aboveground or underground.
Of course, gas prices are now higher than the rate AAA factored into its report. The average price for a gallon of regular is $3.652 nationwide, compared with $3.576 a year ago. Unless that changes dramatically, AAA's cost estimate for 2014 may come in on the low side.