[aerohead]

All the data you collect is valuable information. The more the better.
Considering the specific conditions of each run, you're likely to experience 'trends.' This is your target.
And the more we know the effects of specific mods experienced for cars, from the extant literature, based on empirical test results, the better we can sort out the specifics from the trend line.
There comes a point, when you 'know' your Corolla so much, that you'll have a high confidence that some particular mod is rewarding you with some specific improvement.
I have 432,000-miles of 'test' data on my truck. The log-book is your friend!