Do you trust your ears more than measurements?

I trust the measurements. At this point, audio is not a mystery to science. It knows how to measure the whole frequency spectrum. It knows what the vast majority of people prefer. And it knows about people's proclivity towards cognitive dissonance. Companies like Harmon Karden have been measuring this for decades and sharing the results.

I want to start out neutral and if my preferences differ from that I can always tweak with a slight tone adjustment. But if the measurements start out all over the place, all the tone adjustment in the world may not be able to fix it. Some people will be outliers. Not so much in audible capabilities but in preferences. And that's fine too.

Do you test drive a car that you are considering buying, or do you make a buying decision based on the Road and Track test?

Yes. Both.

The R&D test (objectives) narrow down the field. The test drive determines if everything is satisfactory. How does a car enter your sphere of consideration without first knowing its most important objectives? You can't always tell by looking. A Corvette may look fast, but a Civic Type R may smoke it around the track. That's why you need to look at measurements.