well you can't really measure what getting hit by a vehicle does. There are so many ways to hit somebody when in a vehicle, sometimes you tap them a little and other times it's a full on ownage. It's all an equation taking into account the speed of the object(in this case a vehicle), velocity, and overall impact. A splatter would be all hp is gone because that means you're dead.
Yes, you can hit them infinate different times, so i guess what he says is true, unless your talking about a full on splatter with different vehicles, but eather way, a splatter is a splatter and its a kill lol