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.
1 Todayâs national average price of gas is $3.69 per gallon. Drivers in every state except Colorado are paying higher gas prices than a month ago.  The five states with the highest average prices today include: Hawaii ($4.38), California ($4.26), Connecticut ($3.95), New York ($3.92) and Alaska ($3.90).