The University of Maine suggests using this formula to calculate heating costs: cost per unit times 1,000,000 BTUs/BTUs per unit/efficiency. This formula gives you the fuel cost of 1,000,000 BTUs of heat.The average home requires 50,000,000 to 150,000,000 BTUs of heat each winter according to the U.S. Department of Agriculture.his formula gives you the fuel cost of 1,000,000 BTUs of heat. The average home requires 50,000,000 to 150,000,000 BTUs of heat each winter according to the U.S. Department of Agriculture.
A trailer tireâs load rating refers to how much load the tire is designed to carry at its industry specified pressure. Trailer tires should always be inflated to the maximum psi rating as indicated on the tire. If under inflated, a trailer tireâs side wall will build up more heat faster and cause the tire to fail. This is why trailer tires are designed to have thicker sidewalls â so that they can handle more vertical load.
Tires are given a maximum load rating based on the tire's size, construction and inflation pressure. P-metric sized tires--tires with sizes starting with a P such as P235/75R15--are given a load range rating of either SL or XL. SL stands for Standard Load and XL indicates extra load. An SL-rated tire has its maximum load capacity at an inflation pressure of 35 psi. XL tires can carry a heavier load when inflated to 41 psi.