No cat of mine has ever been great company in the car! When I travel with cats, which thank the Lord isn't often, they grumble and fuss in their carriers, or howl, or swear, or mew piteously. Our Siamese would wait to unleash her most unearthly yowls until the car was close to pedestrians or other uninitiated witnesses. She put on the performance of her life one day when I had to tank up the car on the way back from the cattery where she had spent our vacation, kicking up such a ruckus that the cashier (who was indoors, well away from the diesel pump where the car was parked) felt obliged to ask if there was a baby in the car.