Hmmm....I recall Mojo not really liking the car at first.....but, we took him everywhere and we bought a console car seat (from Snoozer), so he was next to me, but strapped in. He eventually learned to love the car....I know we didn't do anything specific to change it....it just took time, I guess. Now, he is ready to go...I say "go" and he is in his basket.
And I don't know if it was the "car" or not being next to me....at first...but it seems after we got the console seat, he was better (had his blanket in it and it was next to me and he could see out the window).
LilyGrace doesn't throw up in the car, but she gets really nervous and shakes....she has gotten better and finally realizes that almost every time, we go somewhere fun, and then, on the way home, she is 100% better.
You may want to check
HERE, there may be some good advice in this section.