All I ask is they turn up early
Why? I maximise my rest time and arrive at sign on time.
The Captains is responsible for the cost of the operation. The hardest thing I have to deal with is trying to convince the FO without pissing them off, that we really don't need to take more than flight plan fuel when he/she asks to take more for no apparent reason.
Everyone assesses risk differently. If my f/o wants more gas than me I take it as long as it doesn’t prevent us getting the FL I want or push us over a landing weight I think is sensible for the runway at destination.Sounds like your F/o’s are more conservative than you. Such is life, just don’t cock it up or you’ll waste all your savings in one day