The Petrified Fuel Generator is a machine added by Industrial Foregoing. It is used to generate Redstone Flux from solid fuels. Fuels burn for 750 ticks (or 37.5 seconds), but the amount of RF generated per tick can be calculated as:
where is the amount of Tesla produced per tick and is the burn time for the fuel in ticks.
For example, vanilla Coal will generate 60,000 Tesla at a rate of 80 Tesla per tick.