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Yea, slight improvements in design in each item really adds up in the long run. I'm sure the areo is probably slightly better, the engines on their own probably are slightly better, besides the electronics being better and I'm pretty sure the newer electric motors are higher efficiency too. 1-3% here and there really adds up. I think the biggest gain is the battery tech though. Size doesn't matter an insane amount, it just needs to be big enough for worst case situations and whatever charge/discharge allowance they target for longevity of the battery. Pretty sure Lithium Ion is similar to the NiMh where keeping the charge below 100% and above 0% most likely around 60% is the most ideal for longevity.
I'm sure the window tint helps a ton. If it reflects so much, I wonder if it works on painted surfaces too, say the roof. Don't know a whole lot about window tints though. Logic tells me the most reflective paint would likely give the best results, but that's more visual light, and most of the heat is in the IR range.
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