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It's the same premise as this thread: https://www.airportcitygame.com/topic/441-make-a-lot-of-coins-with-inconvertible-coin/

Basically, any bonus that multiplies something (e.g Business Class multiplies your flight income, Dice increases the chances of a flight item drop) could be increased simply by visiting your neighbors (or Madlen) multiple times. It was something like:

[Original Value/Probability] * ( [Original Bonus] + [number of times visited])

So you can see that by visiting your neighbors a crap load of times while the bonus is active, you could set the multiplier to some crazy value. In the case of Secret Facuet, you can regenerate a couple hundred barrels of fuel per minute (as opposed to 1). For Bottomless Barrel, you could set the maximum fuel in the 10,000.

Secret Facuet, essentially, gave you unlimited fuel so long as the bonus was active (and until your game rebooted next - so you could keep it going for a few days if you were careful). The combination of the two was helpful in stocking up fuel once the game returned to normal.