i've been running kerosene for years. 100,000 btu is a bit loud, but heats my poorly insulated 2 car up to 75 deg in about 15 min. originally purchased a propane heater that directed most of the heat up instead of out, and it ran through a standard grill propane tank in about 8 hours. the tank on my kerosene heater lasts me closer to 100 hours, thats a guess, but i usually fill it 3 times a season. if you can find a gas station selling kerosene at the pump, i'd go for it. its under $5 per gallon by me, and i'd bet its even cheaper just about everywhere else in the country
still working on running a 220v line to the garage and just using overhead electric heat
Kerosene. It only stinks if you run too rich and the fuel is about the price of diesel where I'm at. Dad's used one in his garage as long as he's had one... 1989ish, and Grandma still keeps one in her livingroom all winter.
I have a kero heater that I use in my garage. One of those round convection ones. I've had it for years and it is absolutely fantastic but I would never bring it into the house given any other choice. You still smell some oil no matter how clean it is and how pure the kero you burn.
If you are looking to bring it indoors get a catalytic propane heater. They burn clean, have less risk of fire from radiant heat, and don't need any electricity.