Have a similar setup I actually have 2 transmitters in my vehicles one to show the car home and one to show the car running (so it doesn't accidently trigger my garage and locks open).
One is Zigbee arrival sensor the other is a Xbee3pro. They both work pretty much the same.
It is not so much the power/range.
But the biggest issue is the devices transmit rate. I am not at home right now but off the top of my head it is around 5-10 seconds. You can actually drive pretty far in 5-10 seconds.
The Xbee3's transmit rate is settable (which is what I use for opening the garage door) and transmits when it is first powered on. so it opens the garage door when you first turn on your car.
For the Xbee3 in this instance faster transmit rate is fine (since it gets powered down after I turn off my car) but you don't want your hub flooded with events it might crash your hub.
If I stop and pick up my mail 1/2 km (1/4 mile) away my garage door will be already open when I get home but depending how fast I drive and don't pickup my mail the garage door might not be open untill I arrive.
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