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It's probably more accurate to say that you're preventing 1.8% percent in power LOSS for every 10 degrees you can keep the temps cool.
Toyota measured the h.p. at some baseline ambient temp and who knows if the engine was even in the vehicle, when they measured the official stated power output, but if we knew what the baseline ambient temp was that would give us a better of idea when we are losing rated power verses gaining it, giving the intake temp.
But what's interesting is that if my intake temps were say 50 degrees the other day, but during the summer, someone is running 150 degrees on a hot day, with no insulation, that would apparently mean a power difference of 18 percent. Or instead of 212 max h.p. (as an example) they only have 174 and that would translate across the powerband.
To me, one possible advantage of the cooler intake temps as suggested by someone else, is the idea that it may be a solution or partial solution to the common detonation problems most of us seem to have at higher temps.
Also, maybe better slightly fuel economy across the board.
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