We’re in the premier overnight & I totally understand a later train if someone’s travelling & can’t make the earlier Chunnel offering - We can fuel up overnight prior to the train or there’s a fuel station (Stop24) just before the tunnel be it on the other side of the motorway.
There’s also one just off the train in Calais be it it takes you off the road you want to be on.
As we have to add on 1hr the other side, any time saving we can make will be worthwhile