2019 Ram oil concerns

My service indicator seems to agree with the 5K interval. It's come on within 250 miles of 5K every time.

Interestingly, since I've switched to the spec oil (actually the first change I did was an interim blend of 5-30 and one qt of 5-40 since the weight was so far off the spec for the previous 2.5 years)....my average MPG has gone up from 33.5 to 35!

You would think a heavier oil might reduce MPG.