This idea will be unpopular among those players, who use White Flag, but balancing is needed between those, who raid, and those, who opt out of raiding (like myself).
Players who raid, would get a shorter period of time for reaching the cap (at level 55 it is 35 +5 fuel) from the fuel generator. On the contrary, those players, who are secured, would get a longer time period, i.e. they need more time to get the maximum amount of fuel from the generator.
This would increase the number of players who raid, and would balance the game.