I think it is very possible in fact one of my friends ran a diesel 25kw gen for 2 years with 20 lights the gas bill was about $4000 a month. he had a van set up with a 500 gal gas tank inside of it another 500 gal tank inside the generater room and he would fill the van come home and pump the tank into the other. That was back about 2 years ago so the price has probaly went up some.