So, I had an idea and I wanted to see if you guys could come up with a better solution. I want to figure out the highest amout of potential energy (not actual energy, just fuels and such) that can be held in a player's hand - one inventory slot. Here are the rules:

• Whatever you use has to fit in a single inventory space and be carried around without - it cannot be a placed block
• RULE CHANGE - DSUs are allowed, go nuts
• No nested storage - this means no putting containers within containers or using JABBA dollies
• All types of fuel are valid, so long as they can either fit in your hand or a handheld container/tank
• Any fuel you choose must be usable by some sort of power generation of your choice (generator/dynamo/reactor/etc.) without any additional processing - coolants are not counted as processing
• Any mods in an FTB pack are allowed, just state which ones you're using and why - if you use Big Reactors, show a diagram of the reactor design

My best solution is an Extra Utilities bedrockium drum of Thermal Expansion Blazing Pyrotheum, in a Thermal Expansion Magmatic Dynamo with full efficiency augments:

65536000 mB * 2000 RF/mB * 1.85 = 242483200000 RF = 242.5 BRF