Firelog

The firelog is a fuel that lasts much longer than most other fuels with one unit burning for a total of 10 minutes inside items that burn combustible fuels such as a Furnace, Kitchen Stove, and Steam Generator.

Unlike other wood based fuels, it does not leave any components once consumed.

Technology Needed
Chemistry

Trivia
The logo of the firelog strongly resembles Dr. Emmett Brown's Presto Logs from Back to the Future Part III.