I have nearly 3000hrs on 135. Many in police role. I was taught to manage the fuel and often flew to minimums. There is no flaw in this system, it just needs to be managed. Did you realise that 8 uk based aircraft have failed the fuel test in the last 6 weeks? Including Supply tanks showing permanent full and amber fuel caution not illuminating, first indication was reds.......
Info from latest CAA incident bulletin