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Yup the insulation doesn't help to heat the engine up faster (noticeably). It just seems to hold heat better when the engine is off. It loses less than a degree per minute for me now. Its like a logarithmic curve though for heat loss. So typically when i care I will leave the car for likw 20-30 minutes and then come back and the car will still be above 150F so it will still operate like a hybrid. I also have my upper and lower grill on my prius blocked off with a hot air intake pull around 30F over ambient air from the headers. The engine bay still vents itself clearly though. Lots of leaks in the front end, underside, through the wheel wells. etc...
I leave my lower grill blocked year round and use the warm air intake year round as well. I will probably use the insulation year round as well now that I don't tow a boat anymore.
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"I feel like the bad decisions come into play when you trade too much of your time for money paying for things you can't really afford."
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