Originally Posted by the suicidal eggroll
That is not a valid assessment of the results, and is incredibly misleading. Your "total temperature difference", be it 70, 120, or 700 degrees, will change depending on the number of different parts you take a measurement of and add together, making that number by itself entirely useless. At a minimum you should be posting the average temperature drop of all components, definitely not the sum.
You wouldn't stick three pots of water outside, measure a 10 deg drop in each, and say that the outside temperature dropped by 30 degrees would you? Add another pot and it's now a 40 deg drop. When you start doing that, the numbers become meaningless. It's really detracting from the validity of your tests for anybody who knows what they're looking at. I promise you, anybody who looks at the numbers and sees what you've done to get that "70F" number will start to question the legitimacy of the rest of the test setup. Especially since no outside temperature is listed for the tests, just the 68F room in which you're doing the tests, which, since the car is spending almost no time in there, doesn't matter.
If the outside temp really didn't change at all, and the idle time is the same in both tests, then those are impressive results.
I can see your point and understand where you are coming from. For me personally while testing, listing the parts that are affected with before and after results and thinking of it as one net result makes sense to me because the goal is to reduce total underhood temps. I like to look at it this way and you do not. Your saying that its misleading because if you are holding a thermometer over the area it would only read 35F +/- less and not 70F.
I totally see from that perspective your argument and I agree with you with the information that you presented. I would agree more if I was taking multiple readings from the same componant, then giving a net result. But all things aside, the data is here and there is enough that I would hope that one can see a difference that is proven.