IC2 & BC/Railcraft/Forestry cut the burn time of liquid fuels like Ethanol, Fuel, ect to 1/4, and Lava to 1/10th.
Please actually play the mods before you post about them on the forums. I keep telling you to quote your sources, and you keep making up figures out of thin air.
IC2 nerfed lava in geothermal generators to 1/2, not 1/10th. Buildcraft, Railcraft and Forestry did not do anything whatsoever to lava, at all. And if you insist I will prove it with screenshots once I get home, because in contrast to you I can back up my claims.