Yea, I said it wrong - assembly machine is isolated.

Right setup in Electric network info has exactly:

- Right power pole: assembling machine 1 , High capacity accumulator 3 - https://imgur.com/a/8dvJ3w4

- Top power pole: High capacity accumulator 3, Fluid burning generator - https://imgur.com/a/vQd5ofu

Left setup:

- assembling machine 1, Fluid burning generator - https://imgur.com/a/gD3zcJ1

I know about darin that is why I isolated only assembling machine to measure single entity. Assembling machine and Accumulator were empty (no power) until I put barrels with fuel, the difference in time is few seconds but that not explain 10 times more energy from single fuel barrel.

Fuel value of Fuel Oil having angel's mods is 250 kJ, barrel has 50 units so 1 barrel provides 12500 kJ and youre right about charging accumulators but in one condition - input charging speed of all accumulators is greater than max power of all Fluid burning generators.

In short - efficiency of Fluid burning generator is 100% only when it is used in 100%.

Different examples using accumulator so we don't have drain problem.

3 x High capacity accumulators, Input: 3 x 600 kW = 1.8MW = Output of Fluid burning generator 1

1 Fuel oil barrel = 12.5MJ in accumulators

2 x High capacity accumulators, 1 Slow accumulator 3, Input = 1.74MW

1 Fuel oil barrel = 12.9 MJ in accumulators

2 x High capacity accumulators, Input = 12MW

1 Fuel oil barrel = 18.7 MJ in accumulators

1 x High capacity accumulators, 1 Accumulator, Input = 900kW (50% of fluid generator max output)

10 units of Fuel oil = 5MJ in accumulators (expected 2.5MJ)

So if fluid generator can output only 50% of max power then efficiency is 200%

Using Fluid burning generator 3, max output 3.6MW

1 x High capacity accumulators, 1 Accumulator, Input = 900kW (25% on generator max output)

10 units of Fuel oil = 9.7 in accumulators

So it seems that when fluid generator is working with 50% of speed its efficiency is 200%, when only 25% of max power is generated efficiency is almost 400%.

Btw. Fluid burning boilers seems to be not affected by this but I didn't check so deeply.