Quote:
Originally Posted by Phase
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Perfect! That's a combo material which is exactly what you want. It does a little bit of everything in a thin package. If you have enough space (and material) you may want to double / triple up the layers. It adds enough thermal benefit to offset any weight detriment.
In my own case I found the insulation I put in actually had a tiny but measurable impact on my mpg (+0.4%), BUT only in the scenario where I was running the AC or heat near full blast. Otherwise, I could notice a difference in comfort but not on FE.
Hmmm... wait, that statement is inaccurate. *All* the thermal mods I made had that total impact, including the window vinyl, coloring roof white, and roof vent. So the insulation alone is some fraction of that... maybe half? I can't say for certain because while I did all the temperature measurements individually, I did the FE test as a batch after they were all done.
