He's 7 months and I've read that dogs do tend to grow out of it. However he's pretty much fully grown so not sure he will grow out of it.
I drive really slowly, no more than 50-55mph, really slow round bends, roundabouts, etc. Don't give him breakfast before a long car journey. We've tried him in the front and in the back and he's still really bad.
Went out at the weekend and the kids were covered in vomit by the time we got there - had to stop 3x to mop up and change towels and it was a 45 min journey.
Going on a 3 hour journey next month - is it worth seeing if the vet can presribe anything?