Sorry your cost for ng is off base unless you are referring to a complete line from the meter. Generally one can just extend a line to the area needed. Ng dryer does not need a 1.5" or 2" line, 3/4 max most are only 1/2", likely if you have a newer ng furance it is only 1/2' line as well. My cook top, Dryer, furnace, and hot water heater are all1/2" lines. Cost too much to change out the oven from electric to gas but seldom use it anyway. NG dryer is quite a bit less cost to operate in my area given the electric rates at this time. Fifty years ago that was the reverse.