Do we really need to add the repair kit type for each vehicle? All vehicles can be repaired with the basic kit, the improved and advanced kits, though can be used for that purpose, and mainly used just for crafting recipes. I thought you had to use the higher end repair kits too, but I found out you can repair even interceptors with the basic kits.
So far from what I've seen with the repair kits it restores full hp to vehicles. I haven't tried it via the "Repair Vehicle" button on the tab, but rather use the kit itself, which I've been repairing a few people's damaged vehicles in some towns out of kindness, and noticed it that way. But with patch/stanch/whatever healing mutation for live mounts, it will only heal for whatever your skill heals for.