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On most maps I've seen so far, cars are a pretty common form of cover. However, they seem to have a tendency to explode, killing my soldiers. Some of them it's pretty obvious why they exploded, as they were on fire at the time, but twice I've had cars explode for no discernible reason, both times losing me soldiers and once causing me to fail a mission. Why are they exploding, and is there any prior indication that they are going to do so?

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Because Every Car is a Pinto. –  SevenSidedDie Oct 9 '12 at 16:42
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@SevenSidedDie - There should be a warning on TVTropes links. Every time I go there I find myself hours later with twenty tabs open, realizing I've spent the entire day there. –  SaintWacko Oct 9 '12 at 16:52
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TvTropesWillRuinYourLife –  Shykin Oct 9 '12 at 17:00
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@Shykin - Must... Not... Click! –  SaintWacko Oct 9 '12 at 17:02
    
…I'm still stuck there. Just as soon as I finish reading about how a scientist in RealLife once lit a cigarette off a nuclear explosion –  SevenSidedDie Oct 9 '12 at 17:58
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Cars indeed have a damage threshold, 2 of them, even!

First threshold prevents it from catching fire or exploding. (Pistol hitting a car for example) Then once that one is passed the car catches fire. The second one is where it explodes straight away.

Things to remember when using cars for cover or shooting at them:

  • Cars caught fire during your turn explode on your next turn.
  • Cars caught fire during an enemy turn explode on their next turn.
  • Cover remains after a car blew up!
  • You can use grenades and rockets to target and blow up cars before using their cover.
  • Kills done by cars are like grenades and rockets they yield no materials only a corpse (fragments)

From what I read, others report that grenades kill cars instantly, where in my games they never do that. It seems higher difficulty is higher threshold. I play impossible so as such I will not note my damage expectations and experiences.

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The first indication would be the cars taking fire from either you or the enemy. You should see the car degrade from this, even if it's just windows shattering. And yes, I believe I have seen a car catch fire after it's windows were shot out. One assumes that in the future all materials will be flammable or explosive! In any case, so far I've observed a one turn delay every time a car that was on fire exploded, so there is time for soldiers taking cover to get out of the way in these cases.

It's possible to blow a car up without having it catch on fire first. The easiest way to see this would be to have someone throw a grenade at a car, or a heavy shoot a rocket at one. There's no delay there, it just goes boom.

One is given reason to believe that there is simply a damage threshold at work. At this much damage (call it X), the car starts to burn and will soon explode. At that much damage (Y) it explodes straight away. It's almost certainly true that enemy weapons (plasma) are more powerful than the initial x-com armaments, so they're more likely to explode a car as part of a volley than machine guns and assault rifles.

A few observations:

  1. A frag grenade once did not insta-gib a car. It lit on fire and blew next turn.

  2. Once a car was lit I was trying to shoot an alien behind it (lest he escape before it exploded after the alien's turn). First shooter hit the car 2 times in the 3-shot volley from a light plasma rifle. No explosion. Second shooter also hit the car with a 3-shot volley from a light plasma rifle, BOOM. My squad still had actions left at this point.

  3. Mutons. :( (this is just a general observation).

Anecdotally, I think that backs up the damage threshold idea.

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I'll try to keep a closer eye on the cars to see if they have broken windows. I hope plasma weapons can't detonate cars in a single volley. That would be a bit cheap. –  SaintWacko Oct 9 '12 at 16:53
    
@SaintWacko I would agree. I hope to test this some after work and report back. –  peacedog Oct 9 '12 at 16:58
    
I typically assume all cars are bombs after being shot once. In fact I assume virtually all the other cover is a bomb or a trap. –  Shykin Oct 9 '12 at 17:04
    
On second thought, the lack of free-fire will make this difficult to test. :( I will have to rely on observation. –  peacedog Oct 9 '12 at 17:21
    
It hadn't registered yet that there was no free fire. That's too bad. But I guess it makes sense, since normal weapons don't damage walls anymore –  SaintWacko Oct 9 '12 at 17:44
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