Went to helitec yesterday and I got lucky with the fuel situation, only waiting around 10-15mins for Avgas.
I heard that there was only one guy refuelling all the helicopters and he took turns either doing JetA1 or avgas.
If he was in the JetA1 tanker and you needed avgas you were in for a long wait.
That was the only bad experience of a excellent show... I thought the parking area was as impressive as the static display.