From an engineering point of view I'd say the foam just fills the space, dampens sound and keeps the tools in place.
It will collapse under a pressure of maybe 10 kg per square cm or about 1 MN.
The forces in a collision are many thousands of times as high; it stands no chance. You can destroy it by hand... It has no chance against a sledgehammer like impact.
And it needs to collapse; it is inside the rear crumple zone.
The steel sides and bottom of the boot are designed to take the impact of a collision.
In other words, it might protect an object of a few kilograms in a collision.
It has hardly any effect on the 1300 kilograms our cars plus driver and stuff weighs.
The foam insert varies depending on having a spare or not. The spare does have some effect; mainly because of the rim, the tire would collapse.
Then, I would rather not have the LPG tank in the bay between the battery and the bumper, because that is the crumpling zone.
Tight against the rear bench above the battery would be better, but you'd lose the practicality of the folding back seats.
IMHO LPG in a hybrid is a bit ineffective. It is already relatively frugal; not much to be gained.
2011 Insight Elegance
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Accord horn, Waxoyl, HIDs, Green Oil, UltraGauge, LEDs, full upper&partial lower grille block, aero tweeks, plans for several eco mods
Last edited by RedDevil; 10-19-2017 at 08:29 AM.