Travelled and camped with my male cat for about 10 years.
He always came when I called, whether at home or on the road. I won many campground bets. I would yell his name once, sit down and wait. Within a couple minutes Lucy would appear and hop into my lap. Rarely did I ever have to call twice. If I left him out at night, he could be found every morning under the hood of the car. In cold climates, finding a warm car engine is a cat survival technique.
He liked car trips, never had him on a leash.
After the cat died, we got a Wheaton Terrier who would occaisionaly would turn around to see who was calling before she trotted off on unauthorized adventures. Most often, she interpreted 'come' as 'run'.