I used kerosene because back then it was readily available. It purchased it 5 gallons at a time and I got about 3 nights worth of heat from the 5 gallons.
It kept my greenhouse at about 60 degrees even on a breezy night in single digits. I think I used about 15-20 gallons over the course of a typical winter.
As gas as bubble wrap goes, I have no idea as to it's effectiveness. The lathe wood frame covered with 6 mil plastic seemed to meet my needs. I bought it in 100 foot rolls and got 3 winters per roll. Back then the rolls of plastic was about $45. I hate to think what it is now. Home Depot carried it.
