Yeah, talk about diminishing returns, eh?
Fact is, I never plug in for more than an hour anyway; I just did the 1:45 today for the purposes of the graph. 30-45 minutes is more typical.
Now that I've charted it, I can see that anything more than an hour and 15 minutes (#6) is probably not worthwhile in terms of return on time & energy invested.
Note that this probably isn't directly applicable to other cars. The 993 cc motor in the Firefly is a smaller heat sink. I'd guess that bigger motors may "level out" at a higher temperature (though they'll take longer to get there @ the same 800w).
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